77744172356 has 6 divisors (see below), whose sum is σ = 136052301630. Its totient is φ = 38872086176.

The previous prime is 77744172349. The next prime is 77744172371. The reversal of 77744172356 is 65327144777.

It can be written as a sum of positive squares in only one way, i.e., 45607873600 + 32136298756 = 213560^2 + 179266^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77744172298 and 77744172307.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9718021541 + ... + 9718021548.

It is an arithmetic number, because the mean of its divisors is an integer number (22675383605).

Almost surely, 2^77744172356 is an apocalyptic number.

It is an amenable number.

77744172356 is a deficient number, since it is larger than the sum of its proper divisors (58308129274).

77744172356 is a wasteful number, since it uses less digits than its factorization.

77744172356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19436043093 (or 19436043091 counting only the distinct ones).

The product of its digits is 6914880, while the sum is 53.

The spelling of 77744172356 in words is "seventy-seven billion, seven hundred forty-four million, one hundred seventy-two thousand, three hundred fifty-six".