64166969 has 2 divisors, whose sum is σ = 64166970. Its totient is φ = 64166968.

The previous prime is 64166887. The next prime is 64166981. The reversal of 64166969 is 96966146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 1993744 = 7885^2 + 1412^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64166969 is a prime.

It is a super-2 number, since 2×64166969² = 8234799821293922, 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 (64166269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32083484 + 32083485.

It is an arithmetic number, because the mean of its divisors is an integer number (32083485).

Almost surely, 2^64166969 is an apocalyptic number.

It is an amenable number.

64166969 is a deficient number, since it is larger than the sum of its proper divisors (1).

64166969 is an equidigital number, since it uses as much as digits as its factorization.

64166969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 64166969 is about 8010.4287650537. The cubic root of 64166969 is about 400.3475500183.

The spelling of 64166969 in words is "sixty-four million, one hundred sixty-six thousand, nine hundred sixty-nine".