65161979 has 4 divisors (see below), whose sum is σ = 65180976. Its totient is φ = 65142984.

The previous prime is 65161913. The next prime is 65162029. The reversal of 65161979 is 97916156.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65161979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65161909) 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, 2759 + ... + 11744.

It is an arithmetic number, because the mean of its divisors is an integer number (16295244).

Almost surely, 2^65161979 is an apocalyptic number.

65161979 is a deficient number, since it is larger than the sum of its proper divisors (18997).

65161979 is a wasteful number, since it uses less digits than its factorization.

65161979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18996.

The product of its digits is 102060, while the sum is 44.

The square root of 65161979 is about 8072.2970089064. The cubic root of 65161979 is about 402.4062850373.

The spelling of 65161979 in words is "sixty-five million, one hundred sixty-one thousand, nine hundred seventy-nine".