64664606729 has 2 divisors, whose sum is σ = 64664606730. Its totient is φ = 64664606728.

The previous prime is 64664606719. The next prime is 64664606753. The reversal of 64664606729 is 92760646646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36844034704 + 27820572025 = 191948^2 + 166795^2 .

It is a cyclic number.

It is not a de Polignac number, because 64664606729 - 2²⁰ = 64663558153 is a prime.

It is a super-2 number, since 2×64664606729² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64664606719) 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, 32332303364 + 32332303365.

It is an arithmetic number, because the mean of its divisors is an integer number (32332303365).

Almost surely, 2^64664606729 is an apocalyptic number.

It is an amenable number.

64664606729 is a deficient number, since it is larger than the sum of its proper divisors (1).

64664606729 is an equidigital number, since it uses as much as digits as its factorization.

64664606729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 56.

The spelling of 64664606729 in words is "sixty-four billion, six hundred sixty-four million, six hundred six thousand, seven hundred twenty-nine".