64129976909 has 8 divisors (see below), whose sum is σ = 64311760920. Its totient is φ = 63948246336.

The previous prime is 64129976863. The next prime is 64129976927. The reversal of 64129976909 is 90967992146.

It can be written as a sum of positive squares in 4 ways, for example, as 6776911684 + 57353065225 = 82322^2 + 239485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64129976909 - 2²⁰ = 64128928333 is a prime.

It is a super-2 number, since 2×64129976909² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64129976969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4434839 + ... + 4449275.

It is an arithmetic number, because the mean of its divisors is an integer number (8038970115).

Almost surely, 2^64129976909 is an apocalyptic number.

It is an amenable number.

64129976909 is a deficient number, since it is larger than the sum of its proper divisors (181784011).

64129976909 is a wasteful number, since it uses less digits than its factorization.

64129976909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26719.

The product of its (nonzero) digits is 13226976, while the sum is 62.

The spelling of 64129976909 in words is "sixty-four billion, one hundred twenty-nine million, nine hundred seventy-six thousand, nine hundred nine".