64778350016 has 56 divisors (see below), whose sum is σ = 129149581680. Its totient is φ = 32237004800.

The previous prime is 64778349973. The next prime is 64778350027. The reversal of 64778350016 is 61005387746.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22640426 + ... + 22643286.

It is an arithmetic number, because the mean of its divisors is an integer number (2306242530).

Almost surely, 2^64778350016 is an apocalyptic number.

It is an amenable number.

64778350016 is a deficient number, since it is larger than the sum of its proper divisors (64371231664).

64778350016 is a wasteful number, since it uses less digits than its factorization.

64778350016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4413 (or 4403 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 64778350016 in words is "sixty-four billion, seven hundred seventy-eight million, three hundred fifty thousand, sixteen".