77791158986 has 4 divisors (see below), whose sum is σ = 116686738482. Its totient is φ = 38895579492.

The previous prime is 77791158983. The next prime is 77791159007. The reversal of 77791158986 is 68985119777.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 46534686961 + 31256472025 = 215719^2 + 176795^2 .

It is not an unprimeable number, because it can be changed into a prime (77791158983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19447789745 + ... + 19447789748.

Almost surely, 2^77791158986 is an apocalyptic number.

77791158986 is a deficient number, since it is larger than the sum of its proper divisors (38895579496).

77791158986 is a wasteful number, since it uses less digits than its factorization.

77791158986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38895579495.

The product of its digits is 53343360, while the sum is 68.

The spelling of 77791158986 in words is "seventy-seven billion, seven hundred ninety-one million, one hundred fifty-eight thousand, nine hundred eighty-six".