77666794956 has 36 divisors (see below), whose sum is σ = 204860243952. Its totient is φ = 24763325664.

The previous prime is 77666794943. The next prime is 77666794957. The reversal of 77666794956 is 65949766677.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (77666794957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46899411 + ... + 46901066.

It is an arithmetic number, because the mean of its divisors is an integer number (5690562332).

Almost surely, 2^77666794956 is an apocalyptic number.

It is an amenable number.

77666794956 is an abundant number, since it is smaller than the sum of its proper divisors (127193448996).

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

77666794956 is a wasteful number, since it uses less digits than its factorization.

77666794956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93800510 (or 93800505 counting only the distinct ones).

The product of its digits is 720135360, while the sum is 72.

The spelling of 77666794956 in words is "seventy-seven billion, six hundred sixty-six million, seven hundred ninety-four thousand, nine hundred fifty-six".