64610646894 has 32 divisors (see below), whose sum is σ = 143765051040. Its totient is φ = 21509006976.

The previous prime is 64610646883. The next prime is 64610646911. The reversal of 64610646894 is 49864601646.

It is a happy number.

It is a super-2 number, since 2×64610646894² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 64610646894.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 732187 + ... + 815670.

It is an arithmetic number, because the mean of its divisors is an integer number (4492657845).

Almost surely, 2^64610646894 is an apocalyptic number.

64610646894 is an abundant number, since it is smaller than the sum of its proper divisors (79154404146).

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

64610646894 is a wasteful number, since it uses less digits than its factorization.

64610646894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548641 (or 1548635 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 64610646894 in words is "sixty-four billion, six hundred ten million, six hundred forty-six thousand, eight hundred ninety-four".