64380978916 has 12 divisors (see below), whose sum is σ = 112681457980. Its totient is φ = 32186276640.

The previous prime is 64380978913. The next prime is 64380978923. The reversal of 64380978916 is 61987908346.

It can be written as a sum of positive squares in 2 ways, for example, as 52422681600 + 11958297316 = 228960^2 + 109354^2 .

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (64380978913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1018695 + ... + 1080046.

Almost surely, 2^64380978916 is an apocalyptic number.

It is an amenable number.

64380978916 is a deficient number, since it is larger than the sum of its proper divisors (48300479064).

64380978916 is a wasteful number, since it uses less digits than its factorization.

64380978916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106414 (or 2106412 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 64380978916 in words is "sixty-four billion, three hundred eighty million, nine hundred seventy-eight thousand, nine hundred sixteen".