7997667997 has 16 divisors (see below), whose sum is σ = 8935743168. Its totient is φ = 7095070080.

The previous prime is 7997667989. The next prime is 7997668033.

7997667997 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 7997667997 - 2³ = 7997667989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7997607997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557203 + ... + 571375.

It is an arithmetic number, because the mean of its divisors is an integer number (558483948).

Almost surely, 2^7997667997 is an apocalyptic number.

It is an amenable number.

7997667997 is a deficient number, since it is larger than the sum of its proper divisors (938075171).

7997667997 is a wasteful number, since it uses less digits than its factorization.

7997667997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15420.

The product of its digits is 567106596, while the sum is 76.

The square root of 7997667997 is about 89429.6818567527. The cubic root of 7997667997 is about 1999.8056475308.

The spelling of 7997667997 in words is "seven billion, nine hundred ninety-seven million, six hundred sixty-seven thousand, nine hundred ninety-seven".