64719623776 has 96 divisors (see below), whose sum is σ = 131289984000. Its totient is φ = 31395167232.

The previous prime is 64719623693. The next prime is 64719623783. The reversal of 64719623776 is 67732691746.

It is a self number, because there is not a number n which added to its sum of digits gives 64719623776.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40272765 + ... + 40274371.

It is an arithmetic number, because the mean of its divisors is an integer number (1367604000).

Almost surely, 2^64719623776 is an apocalyptic number.

It is an amenable number.

64719623776 is an abundant number, since it is smaller than the sum of its proper divisors (66570360224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64719623776 is a wasteful number, since it uses less digits than its factorization.

64719623776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964 (or 1956 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 58.

The spelling of 64719623776 in words is "sixty-four billion, seven hundred nineteen million, six hundred twenty-three thousand, seven hundred seventy-six".