7897699161 has 27 divisors (see below), whose sum is σ = 12543796447. Its totient is φ = 4784706960.

The previous prime is 7897699151. The next prime is 7897699193. The reversal of 7897699161 is 1619967987.

The square root of 7897699161 is 88869.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3240455625 + 4657243536 = 56925^2 + 68244^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7897699161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7897699111) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2931331 + ... + 2934023.

Almost surely, 2^7897699161 is an apocalyptic number.

7897699161 is the 88869-th square number.

7897699161 is the 44435-th centered octagonal number.

It is an amenable number.

7897699161 is a deficient number, since it is larger than the sum of its proper divisors (4646097286).

7897699161 is an equidigital number, since it uses as much as digits as its factorization.

7897699161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5414 (or 2707 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 63.

The cubic root of 7897699161 is about 1991.4383312969.

The spelling of 7897699161 in words is "seven billion, eight hundred ninety-seven million, six hundred ninety-nine thousand, one hundred sixty-one".