64947164994 has 24 divisors (see below), whose sum is σ = 142169571180. Its totient is φ = 21425868288.

The previous prime is 64947164921. The next prime is 64947165029. The reversal of 64947164994 is 49946174946.

64947164994 is a `hidden beast` number, since 6 + 494 + 7 + 16 + 49 + 94 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 62352587025 + 2594577969 = 249705^2 + 50937^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18597099 + ... + 18600590.

Almost surely, 2^64947164994 is an apocalyptic number.

64947164994 is an abundant number, since it is smaller than the sum of its proper divisors (77222406186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64947164994 is a wasteful number, since it uses less digits than its factorization.

64947164994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37197794 (or 37197791 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 63.

The spelling of 64947164994 in words is "sixty-four billion, nine hundred forty-seven million, one hundred sixty-four thousand, nine hundred ninety-four".