64721588718064 has 10 divisors (see below), whose sum is σ = 125398078141280. Its totient is φ = 32360794359024.

The previous prime is 64721588718037. The next prime is 64721588718091. The reversal of 64721588718064 is 46081788512746.

It is an interprime number because it is at equal distance from previous prime (64721588718037) and next prime (64721588718091).

It is a super-3 number, since 3×64721588718064³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2022549647424 + ... + 2022549647455.

It is an arithmetic number, because the mean of its divisors is an integer number (12539807814128).

Almost surely, 2^{64721588718064} is an apocalyptic number.

It is an amenable number.

64721588718064 is a deficient number, since it is larger than the sum of its proper divisors (60676489423216).

64721588718064 is a wasteful number, since it uses less digits than its factorization.

64721588718064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4045099294887 (or 4045099294881 counting only the distinct ones).

The product of its (nonzero) digits is 144506880, while the sum is 67.

The spelling of 64721588718064 in words is "sixty-four trillion, seven hundred twenty-one billion, five hundred eighty-eight million, seven hundred eighteen thousand, sixty-four".