64979969 has 2 divisors, whose sum is σ = 64979970. Its totient is φ = 64979968.

The previous prime is 64979963. The next prime is 64979977. The reversal of 64979969 is 96997946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 7219969 = 7600^2 + 2687^2 .

It is a cyclic number.

It is not a de Polignac number, because 64979969 - 2¹⁶ = 64914433 is a prime.

It is a super-2 number, since 2×64979969² = 8444792742481922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (64979963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32489984 + 32489985.

It is an arithmetic number, because the mean of its divisors is an integer number (32489985).

Almost surely, 2^64979969 is an apocalyptic number.

It is an amenable number.

64979969 is a deficient number, since it is larger than the sum of its proper divisors (1).

64979969 is an equidigital number, since it uses as much as digits as its factorization.

64979969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6613488, while the sum is 59.

The square root of 64979969 is about 8061.0153826922. The cubic root of 64979969 is about 402.0312694834.

The spelling of 64979969 in words is "sixty-four million, nine hundred seventy-nine thousand, nine hundred sixty-nine".