155875617978 has 32 divisors (see below), whose sum is σ = 313998902784. Its totient is φ = 51584684592.

The previous prime is 155875617959. The next prime is 155875617979. The reversal of 155875617978 is 879716578551.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (155875617979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 734601 + ... + 922707.

It is an arithmetic number, because the mean of its divisors is an integer number (9812465712).

Almost surely, 2^155875617978 is an apocalyptic number.

155875617978 is an abundant number, since it is smaller than the sum of its proper divisors (158123284806).

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

155875617978 is a wasteful number, since it uses less digits than its factorization.

155875617978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189106.

The product of its digits is 148176000, while the sum is 69.

The spelling of 155875617978 in words is "one hundred fifty-five billion, eight hundred seventy-five million, six hundred seventeen thousand, nine hundred seventy-eight".