77779139156 has 12 divisors (see below), whose sum is σ = 137362241940. Its totient is φ = 38532784320.

The previous prime is 77779139117. The next prime is 77779139161. The reversal of 77779139156 is 65193197777.

It can be written as a sum of positive squares in 2 ways, for example, as 69081711556 + 8697427600 = 262834^2 + 93260^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89195825 + ... + 89196696.

It is an arithmetic number, because the mean of its divisors is an integer number (11446853495).

Almost surely, 2^77779139156 is an apocalyptic number.

It is an amenable number.

77779139156 is a deficient number, since it is larger than the sum of its proper divisors (59583102784).

77779139156 is a wasteful number, since it uses less digits than its factorization.

77779139156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178392634 (or 178392632 counting only the distinct ones).

The product of its digits is 17503290, while the sum is 62.

The spelling of 77779139156 in words is "seventy-seven billion, seven hundred seventy-nine million, one hundred thirty-nine thousand, one hundred fifty-six".