65979339977 has 2 divisors, whose sum is σ = 65979339978. Its totient is φ = 65979339976.

The previous prime is 65979339947. The next prime is 65979340043. The reversal of 65979339977 is 77993397956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54839804041 + 11139535936 = 234179^2 + 105544^2 .

It is a cyclic number.

It is not a de Polignac number, because 65979339977 - 2⁸ = 65979339721 is a prime.

It is not a weakly prime, because it can be changed into another prime (65979339917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32989669988 + 32989669989.

It is an arithmetic number, because the mean of its divisors is an integer number (32989669989).

Almost surely, 2^65979339977 is an apocalyptic number.

It is an amenable number.

65979339977 is a deficient number, since it is larger than the sum of its proper divisors (1).

65979339977 is an equidigital number, since it uses as much as digits as its factorization.

65979339977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 607614210, while the sum is 74.

The spelling of 65979339977 in words is "sixty-five billion, nine hundred seventy-nine million, three hundred thirty-nine thousand, nine hundred seventy-seven".