155015625555 has 144 divisors (see below), whose sum is σ = 324859901184. Its totient is φ = 70706623680.

The previous prime is 155015625539. The next prime is 155015625577. The reversal of 155015625555 is 555526510551.

155015625555 is a `hidden beast` number, since 1 + 5 + 5 + 0 + 15 + 625 + 5 + 5 + 5 = 666.

It is not a de Polignac number, because 155015625555 - 2⁴ = 155015625539 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 155015625555.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 29229034 + ... + 29234336.

It is an arithmetic number, because the mean of its divisors is an integer number (2255971536).

Almost surely, 2^155015625555 is an apocalyptic number.

155015625555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155015625555 is an abundant number, since it is smaller than the sum of its proper divisors (169844275629).

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

155015625555 is an equidigital number, since it uses as much as digits as its factorization.

155015625555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5828 (or 5809 counting only the distinct ones).

The product of its (nonzero) digits is 937500, while the sum is 45.

The spelling of 155015625555 in words is "one hundred fifty-five billion, fifteen million, six hundred twenty-five thousand, five hundred fifty-five".