79961965 has 12 divisors (see below), whose sum is σ = 101932596. Its totient is φ = 60205568.

The previous prime is 79961963. The next prime is 79961969. The reversal of 79961965 is 56916997.

It can be written as a sum of positive squares in 6 ways, for example, as 2010724 + 77951241 = 1418^2 + 8829^2 .

It is not a de Polignac number, because 79961965 - 2¹ = 79961963 is a prime.

It is a super-2 number, since 2×79961965² = 12787831693322450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79961963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26224 + ... + 29113.

It is an arithmetic number, because the mean of its divisors is an integer number (8494383).

Almost surely, 2^79961965 is an apocalyptic number.

It is an amenable number.

79961965 is a deficient number, since it is larger than the sum of its proper divisors (21970631).

79961965 is a wasteful number, since it uses less digits than its factorization.

79961965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55376 (or 55359 counting only the distinct ones).

The product of its digits is 918540, while the sum is 52.

The square root of 79961965 is about 8942.1454360796. The cubic root of 79961965 is about 430.8186405787.

The spelling of 79961965 in words is "seventy-nine million, nine hundred sixty-one thousand, nine hundred sixty-five".