79665697 has 4 divisors (see below), whose sum is σ = 82412820. Its totient is φ = 76918576.

The previous prime is 79665679. The next prime is 79665701. The reversal of 79665697 is 79656697.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67387681 + 12278016 = 8209^2 + 3504^2 .

It is a cyclic number.

It is not a de Polignac number, because 79665697 - 2⁷ = 79665569 is a prime.

It is a super-3 number, since 3×79665697³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79665647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1373518 + ... + 1373575.

It is an arithmetic number, because the mean of its divisors is an integer number (20603205).

Almost surely, 2^79665697 is an apocalyptic number.

It is an amenable number.

79665697 is a deficient number, since it is larger than the sum of its proper divisors (2747123).

79665697 is a wasteful number, since it uses less digits than its factorization.

79665697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2747122.

The product of its digits is 4286520, while the sum is 55.

The square root of 79665697 is about 8925.5642398674. The cubic root of 79665697 is about 430.2859050475.

The spelling of 79665697 in words is "seventy-nine million, six hundred sixty-five thousand, six hundred ninety-seven".