155891256858 has 28 divisors (see below), whose sum is σ = 350594949258. Its totient is φ = 51963751800.

The previous prime is 155891256809. The next prime is 155891256883. The reversal of 155891256858 is 858652198551.

155891256858 is a `hidden beast` number, since 1 + 5 + 5 + 8 + 9 + 12 + 568 + 58 = 666.

It can be written as a sum of positive squares in only one way, i.e., 142292665089 + 13598591769 = 377217^2 + 116613^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155891256795 and 155891256804.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 53459193 + ... + 53462108.

Almost surely, 2^155891256858 is an apocalyptic number.

155891256858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

155891256858 is an abundant number, since it is smaller than the sum of its proper divisors (194703692400).

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

155891256858 is an equidigital number, since it uses as much as digits as its factorization.

155891256858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106921321 (or 106921306 counting only the distinct ones).

The product of its digits is 34560000, while the sum is 63.

The spelling of 155891256858 in words is "one hundred fifty-five billion, eight hundred ninety-one million, two hundred fifty-six thousand, eight hundred fifty-eight".