64500649677 has 20 divisors (see below), whose sum is σ = 96656812956. Its totient is φ = 42864768000.

The previous prime is 64500649667. The next prime is 64500649691. The reversal of 64500649677 is 77694600546.

64500649677 is a `hidden beast` number, since 6 + 4 + 500 + 64 + 9 + 6 + 77 = 666.

64500649677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 21629290761 + 42871358916 = 147069^2 + 207054^2 .

It is not a de Polignac number, because 64500649677 - 2⁶ = 64500649613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64500649667) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1230324 + ... + 1281677.

Almost surely, 2^64500649677 is an apocalyptic number.

It is an amenable number.

64500649677 is a deficient number, since it is larger than the sum of its proper divisors (32156163279).

64500649677 is a wasteful number, since it uses less digits than its factorization.

64500649677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512330 (or 2512321 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 64500649677 in words is "sixty-four billion, five hundred million, six hundred forty-nine thousand, six hundred seventy-seven".