155245431321540 has 72 divisors (see below), whose sum is σ = 538184161919040. Its totient is φ = 35484670016064.

The previous prime is 155245431321529. The next prime is 155245431321557. The reversal of 155245431321540 is 45123134542551.

155245431321540 is a `hidden beast` number, since 1 + 5 + 5 + 2 + 4 + 54 + 31 + 3 + 21 + 540 = 666.

It is a super-2 number, since 2×155245431321540² (a number of 29 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61605328630 + ... + 61605331149.

Almost surely, 2^{155245431321540} is an apocalyptic number.

155245431321540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155245431321540 is an abundant number, since it is smaller than the sum of its proper divisors (382938730597500).

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

155245431321540 is a wasteful number, since it uses less digits than its factorization.

155245431321540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123210659801 (or 123210659796 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 45.

The spelling of 155245431321540 in words is "one hundred fifty-five trillion, two hundred forty-five billion, four hundred thirty-one million, three hundred twenty-one thousand, five hundred forty".