64906764929251 has 12 divisors (see below), whose sum is σ = 77939393833920. Its totient is φ = 53839712843280.

The previous prime is 64906764929221. The next prime is 64906764929351. The reversal of 64906764929251 is 15292946760946.

It is not a de Polignac number, because 64906764929251 - 2¹⁵ = 64906764896483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64906764929221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21364963896 + ... + 21364966933.

It is an arithmetic number, because the mean of its divisors is an integer number (6494949486160).

Almost surely, 2^{64906764929251} is an apocalyptic number.

64906764929251 is a deficient number, since it is larger than the sum of its proper divisors (13032628904669).

64906764929251 is a wasteful number, since it uses less digits than its factorization.

64906764929251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42729930874 (or 42729930867 counting only the distinct ones).

The product of its (nonzero) digits is 352719360, while the sum is 70.

The spelling of 64906764929251 in words is "sixty-four trillion, nine hundred six billion, seven hundred sixty-four million, nine hundred twenty-nine thousand, two hundred fifty-one".