65620979 has 2 divisors, whose sum is σ = 65620980. Its totient is φ = 65620978.

The previous prime is 65620931. The next prime is 65620981. The reversal of 65620979 is 97902656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65620979 - 2¹² = 65616883 is a prime.

It is a super-2 number, since 2×65620979² = 8612225769836882, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 65620981, 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 (65620999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32810489 + 32810490.

It is an arithmetic number, because the mean of its divisors is an integer number (32810490).

Almost surely, 2^65620979 is an apocalyptic number.

65620979 is a deficient number, since it is larger than the sum of its proper divisors (1).

65620979 is an equidigital number, since it uses as much as digits as its factorization.

65620979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 65620979 is about 8100.6776877000. The cubic root of 65620979 is about 403.3489231200.

The spelling of 65620979 in words is "sixty-five million, six hundred twenty thousand, nine hundred seventy-nine".