66565765979 has 2 divisors, whose sum is σ = 66565765980. Its totient is φ = 66565765978.

The previous prime is 66565765957. The next prime is 66565765991. The reversal of 66565765979 is 97956756566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66565765979 is a prime.

It is not a weakly prime, because it can be changed into another prime (66565765919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33282882989 + 33282882990.

It is an arithmetic number, because the mean of its divisors is an integer number (33282882990).

Almost surely, 2^66565765979 is an apocalyptic number.

66565765979 is a deficient number, since it is larger than the sum of its proper divisors (1).

66565765979 is an equidigital number, since it uses as much as digits as its factorization.

66565765979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 642978000, while the sum is 71.

The spelling of 66565765979 in words is "sixty-six billion, five hundred sixty-five million, seven hundred sixty-five thousand, nine hundred seventy-nine".