7977986216 has 8 divisors (see below), whose sum is σ = 14958724170. Its totient is φ = 3988993104.

The previous prime is 7977986201. The next prime is 7977986227. The reversal of 7977986216 is 6126897797.

It can be written as a sum of positive squares in only one way, i.e., 4949685316 + 3028300900 = 70354^2 + 55030^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498624131 + ... + 498624146.

Almost surely, 2^7977986216 is an apocalyptic number.

It is an amenable number.

7977986216 is a deficient number, since it is larger than the sum of its proper divisors (6980737954).

7977986216 is a wasteful number, since it uses less digits than its factorization.

7977986216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997248283 (or 997248279 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 62.

The square root of 7977986216 is about 89319.5735323451. The cubic root of 7977986216 is about 1998.1638327608.

The spelling of 7977986216 in words is "seven billion, nine hundred seventy-seven million, nine hundred eighty-six thousand, two hundred sixteen".