65611979 has 2 divisors, whose sum is σ = 65611980. Its totient is φ = 65611978.

The previous prime is 65611969. The next prime is 65612003. The reversal of 65611979 is 97911656.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65611979 - 2⁸ = 65611723 is a prime.

It is not a weakly prime, because it can be changed into another prime (65611969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32805989 + 32805990.

It is an arithmetic number, because the mean of its divisors is an integer number (32805990).

Almost surely, 2^65611979 is an apocalyptic number.

65611979 is a deficient number, since it is larger than the sum of its proper divisors (1).

65611979 is an equidigital number, since it uses as much as digits as its factorization.

65611979 is an evil number, because the sum of its binary digits is even.

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

The square root of 65611979 is about 8100.1221595727. The cubic root of 65611979 is about 403.3304823391.

The spelling of 65611979 in words is "sixty-five million, six hundred eleven thousand, nine hundred seventy-nine".