64646667770 has 16 divisors (see below), whose sum is σ = 116408959488. Its totient is φ = 25848676560.

The previous prime is 64646667727. The next prime is 64646667791. The reversal of 64646667770 is 7776664646.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1221614 + ... + 1273433.

It is an arithmetic number, because the mean of its divisors is an integer number (7275559968).

Almost surely, 2^64646667770 is an apocalyptic number.

64646667770 is a deficient number, since it is larger than the sum of its proper divisors (51762291718).

64646667770 is a wasteful number, since it uses less digits than its factorization.

64646667770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497645.

The product of its (nonzero) digits is 42674688, while the sum is 59.

The spelling of 64646667770 in words is "sixty-four billion, six hundred forty-six million, six hundred sixty-seven thousand, seven hundred seventy".