64777117766 has 16 divisors (see below), whose sum is σ = 98357991984. Its totient is φ = 31991292384.

The previous prime is 64777117739. The next prime is 64777117777. The reversal of 64777117766 is 66771177746.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758420 + ... + 839496.

It is an arithmetic number, because the mean of its divisors is an integer number (6147374499).

Almost surely, 2^64777117766 is an apocalyptic number.

64777117766 is a deficient number, since it is larger than the sum of its proper divisors (33580874218).

64777117766 is a wasteful number, since it uses less digits than its factorization.

64777117766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85975.

The product of its digits is 14521248, while the sum is 59.

The spelling of 64777117766 in words is "sixty-four billion, seven hundred seventy-seven million, one hundred seventeen thousand, seven hundred sixty-six".