65990979 has 24 divisors (see below), whose sum is σ = 102903840. Its totient is φ = 40626432.

The previous prime is 65990963. The next prime is 65990993. The reversal of 65990979 is 97909956.

It is not a de Polignac number, because 65990979 - 2⁴ = 65990963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65990929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 507 + ... + 11499.

It is an arithmetic number, because the mean of its divisors is an integer number (4287660).

Almost surely, 2^65990979 is an apocalyptic number.

65990979 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

65990979 is a deficient number, since it is larger than the sum of its proper divisors (36912861).

65990979 is a wasteful number, since it uses less digits than its factorization.

65990979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11051 (or 11048 counting only the distinct ones).

The product of its (nonzero) digits is 1377810, while the sum is 54.

The square root of 65990979 is about 8123.4831814930. The cubic root of 65990979 is about 404.1055890888.

The spelling of 65990979 in words is "sixty-five million, nine hundred ninety thousand, nine hundred seventy-nine".