155998556 has 36 divisors (see below), whose sum is σ = 318411576. Its totient is φ = 66679200.

The previous prime is 155998529. The next prime is 155998561. The reversal of 155998556 is 655899551.

It is a junction number, because it is equal to n+sod(n) for n = 155998498 and 155998507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95426 + ... + 97046.

It is an arithmetic number, because the mean of its divisors is an integer number (8844766).

Almost surely, 2^155998556 is an apocalyptic number.

It is an amenable number.

155998556 is an abundant number, since it is smaller than the sum of its proper divisors (162413020).

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

155998556 is a wasteful number, since it uses less digits than its factorization.

155998556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130 (or 2121 counting only the distinct ones).

The product of its digits is 2430000, while the sum is 53.

The square root of 155998556 is about 12489.9381903995. The cubic root of 155998556 is about 538.3196002295.

The spelling of 155998556 in words is "one hundred fifty-five million, nine hundred ninety-eight thousand, five hundred fifty-six".