64056969891 has 24 divisors (see below), whose sum is σ = 95017575744. Its totient is φ = 41565070080.

The previous prime is 64056969883. The next prime is 64056969913. The reversal of 64056969891 is 19896965046.

64056969891 is a `hidden beast` number, since 6 + 4 + 0 + 569 + 69 + 8 + 9 + 1 = 666.

It is not a de Polignac number, because 64056969891 - 2³ = 64056969883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64056969871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 341766 + ... + 494891.

It is an arithmetic number, because the mean of its divisors is an integer number (3959065656).

Almost surely, 2^64056969891 is an apocalyptic number.

64056969891 is a deficient number, since it is larger than the sum of its proper divisors (30960605853).

64056969891 is a wasteful number, since it uses less digits than its factorization.

64056969891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836891 (or 836888 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 64056969891 in words is "sixty-four billion, fifty-six million, nine hundred sixty-nine thousand, eight hundred ninety-one".