108158661540 has 144 divisors (see below), whose sum is σ = 332370969840. Its totient is φ = 28466380800.

The previous prime is 108158661529. The next prime is 108158661547. The reversal of 108158661540 is 45166851801.

108158661540 is a `hidden beast` number, since 1 + 0 + 8 + 1 + 586 + 61 + 5 + 4 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 7374000384 + 100784661156 = 85872^2 + 317466^2 .

It is a super-2 number, since 2×108158661540² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (108158661547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9237690 + ... + 9249390.

It is an arithmetic number, because the mean of its divisors is an integer number (2308131735).

Almost surely, 2^108158661540 is an apocalyptic number.

108158661540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 108158661540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166185484920).

108158661540 is an abundant number, since it is smaller than the sum of its proper divisors (224212308300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

108158661540 is a wasteful number, since it uses less digits than its factorization.

108158661540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12382 (or 12377 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 108158661540 in words is "one hundred eight billion, one hundred fifty-eight million, six hundred sixty-one thousand, five hundred forty".