78111306256 has 45 divisors (see below), whose sum is σ = 153002579821. Its totient is φ = 38631396416.

The previous prime is 78111306241. The next prime is 78111306281. The reversal of 78111306256 is 65260311187.

It is a happy number.

The square root of 78111306256 is 279484.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18176432400 + 59934873856 = 134820^2 + 244816^2 .

It is a super-2 number, since 2×78111306256² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 119618826 + ... + 119619478.

Almost surely, 2^78111306256 is an apocalyptic number.

78111306256 is the 279484-th square number.

It is an amenable number.

78111306256 is a deficient number, since it is larger than the sum of its proper divisors (74891273565).

78111306256 is an frugal number, since it uses more digits than its factorization.

78111306256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 78111306256 in words is "seventy-eight billion, one hundred eleven million, three hundred six thousand, two hundred fifty-six".