64721334651116 has 48 divisors (see below), whose sum is σ = 135894580416000. Its totient is φ = 26578021657920.

The previous prime is 64721334651047. The next prime is 64721334651119. The reversal of 64721334651116 is 61115643312746.

64721334651116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (64721334651119) 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 15 ways as a sum of consecutive naturals, for example, 1203687866 + ... + 1203741633.

It is an arithmetic number, because the mean of its divisors is an integer number (2831137092000).

Almost surely, 2^{64721334651116} is an apocalyptic number.

It is an amenable number.

64721334651116 is an abundant number, since it is smaller than the sum of its proper divisors (71173245764884).

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

64721334651116 is a wasteful number, since it uses less digits than its factorization.

64721334651116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407429574 (or 2407429572 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 50.

The spelling of 64721334651116 in words is "sixty-four trillion, seven hundred twenty-one billion, three hundred thirty-four million, six hundred fifty-one thousand, one hundred sixteen".