78297178155 has 48 divisors (see below), whose sum is σ = 150753791520. Its totient is φ = 34558745088.

The previous prime is 78297178121. The next prime is 78297178163. The reversal of 78297178155 is 55187179287.

It is not a de Polignac number, because 78297178155 - 2¹⁰ = 78297177131 is a prime.

It is a super-2 number, since 2×78297178155² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1815354 + ... + 1857983.

It is an arithmetic number, because the mean of its divisors is an integer number (3140703990).

Almost surely, 2^78297178155 is an apocalyptic number.

78297178155 is a deficient number, since it is larger than the sum of its proper divisors (72456613365).

78297178155 is a wasteful number, since it uses less digits than its factorization.

78297178155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673388 (or 3673381 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 60.

The spelling of 78297178155 in words is "seventy-eight billion, two hundred ninety-seven million, one hundred seventy-eight thousand, one hundred fifty-five".