155555816 has 24 divisors (see below), whose sum is σ = 314360130. Its totient is φ = 71736288.

The previous prime is 155555809. The next prime is 155555837. The reversal of 155555816 is 618555551.

155555816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 149572900 + 5982916 = 12230^2 + 2446^2 .

It is a super-2 number, since 2×155555816² = 48395223782851712, which contains 22 as substring.

It is a zygodrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 126581 + ... + 127803.

Almost surely, 2^155555816 is an apocalyptic number.

It is an amenable number.

155555816 is an abundant number, since it is smaller than the sum of its proper divisors (158804314).

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

155555816 is an equidigital number, since it uses as much as digits as its factorization.

155555816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465 (or 1238 counting only the distinct ones).

The product of its digits is 150000, while the sum is 41.

The square root of 155555816 is about 12472.2017302480. The cubic root of 155555816 is about 537.8098488236.

The spelling of 155555816 in words is "one hundred fifty-five million, five hundred fifty-five thousand, eight hundred sixteen".