972641665 has 4 divisors (see below), whose sum is σ = 1167170004. Its totient is φ = 778113328.

The previous prime is 972641651. The next prime is 972641693. The reversal of 972641665 is 566146279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566146279 = 3121 ⋅181399.

It can be written as a sum of positive squares in 2 ways, for example, as 363588624 + 609053041 = 19068^2 + 24679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-972641665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97264162 + ... + 97264171.

It is an arithmetic number, because the mean of its divisors is an integer number (291792501).

Almost surely, 2^972641665 is an apocalyptic number.

It is an amenable number.

972641665 is a deficient number, since it is larger than the sum of its proper divisors (194528339).

972641665 is a wasteful number, since it uses less digits than its factorization.

972641665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194528338.

The product of its digits is 544320, while the sum is 46.

The square root of 972641665 is about 31187.2035456852. The cubic root of 972641665 is about 990.7961031759.

The spelling of 972641665 in words is "nine hundred seventy-two million, six hundred forty-one thousand, six hundred sixty-five".