64695007977 has 4 divisors (see below), whose sum is σ = 86260010640. Its totient is φ = 43130005316.

The previous prime is 64695007921. The next prime is 64695007991. The reversal of 64695007977 is 77970059646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64695007977 - 2¹⁰ = 64695006953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64695007977.

It is not an unprimeable number, because it can be changed into a prime (64695007477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10782501327 + ... + 10782501332.

It is an arithmetic number, because the mean of its divisors is an integer number (21565002660).

Almost surely, 2^64695007977 is an apocalyptic number.

It is an amenable number.

64695007977 is a deficient number, since it is larger than the sum of its proper divisors (21565002663).

64695007977 is a wasteful number, since it uses less digits than its factorization.

64695007977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21565002662.

The product of its (nonzero) digits is 20003760, while the sum is 60.

The spelling of 64695007977 in words is "sixty-four billion, six hundred ninety-five million, seven thousand, nine hundred seventy-seven".