64646669 has 2 divisors, whose sum is σ = 64646670. Its totient is φ = 64646668.

The previous prime is 64646653. The next prime is 64646677. The reversal of 64646669 is 96664646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54213769 + 10432900 = 7363^2 + 3230^2 .

It is a cyclic number.

It is not a de Polignac number, because 64646669 - 2⁴ = 64646653 is a prime.

It is a super-2 number, since 2×64646669² = 8358383625591122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64646609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32323334 + 32323335.

It is an arithmetic number, because the mean of its divisors is an integer number (32323335).

Almost surely, 2^64646669 is an apocalyptic number.

It is an amenable number.

64646669 is a deficient number, since it is larger than the sum of its proper divisors (1).

64646669 is an equidigital number, since it uses as much as digits as its factorization.

64646669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 47.

The square root of 64646669 is about 8040.3152301387. The cubic root of 64646669 is about 401.3427148323.

The spelling of 64646669 in words is "sixty-four million, six hundred forty-six thousand, six hundred sixty-nine".