77199845992 has 8 divisors (see below), whose sum is σ = 144749711250. Its totient is φ = 38599922992.

The previous prime is 77199845939. The next prime is 77199845999. The reversal of 77199845992 is 29954899177.

It can be written as a sum of positive squares in only one way, i.e., 70582674276 + 6617171716 = 265674^2 + 81346^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (77199845999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4824990367 + ... + 4824990382.

Almost surely, 2^77199845992 is an apocalyptic number.

It is an amenable number.

77199845992 is a deficient number, since it is larger than the sum of its proper divisors (67549865258).

77199845992 is a wasteful number, since it uses less digits than its factorization.

77199845992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9649980755 (or 9649980751 counting only the distinct ones).

The product of its digits is 102876480, while the sum is 70.

The spelling of 77199845992 in words is "seventy-seven billion, one hundred ninety-nine million, eight hundred forty-five thousand, nine hundred ninety-two".