161532258858 has 112 divisors (see below), whose sum is σ = 366030835200. Its totient is φ = 53438289408.

The previous prime is 161532258841. The next prime is 161532258859. The reversal of 161532258858 is 858852235161.

161532258858 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 3 + 2 + 2 + 588 + 58 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (161532258859) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 148603191 + ... + 148604277.

Almost surely, 2^161532258858 is an apocalyptic number.

161532258858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161532258858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183015417600).

161532258858 is an abundant number, since it is smaller than the sum of its proper divisors (204498576342).

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

161532258858 is a wasteful number, since it uses less digits than its factorization.

161532258858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1768 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 54.

The spelling of 161532258858 in words is "one hundred sixty-one billion, five hundred thirty-two million, two hundred fifty-eight thousand, eight hundred fifty-eight".