65677979 has 2 divisors, whose sum is σ = 65677980. Its totient is φ = 65677978.

The previous prime is 65677957. The next prime is 65677981. The reversal of 65677979 is 97977656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65677979 - 2⁸ = 65677723 is a prime.

Together with 65677981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65677279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32838989 + 32838990.

It is an arithmetic number, because the mean of its divisors is an integer number (32838990).

Almost surely, 2^65677979 is an apocalyptic number.

65677979 is a deficient number, since it is larger than the sum of its proper divisors (1).

65677979 is an equidigital number, since it uses as much as digits as its factorization.

65677979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5000940, while the sum is 56.

The square root of 65677979 is about 8104.1951481933. The cubic root of 65677979 is about 403.4656755944.

The spelling of 65677979 in words is "sixty-five million, six hundred seventy-seven thousand, nine hundred seventy-nine".