64512721194 has 32 divisors (see below), whose sum is σ = 129790699584. Its totient is φ = 21376794240.

The previous prime is 64512721193. The next prime is 64512721237. The reversal of 64512721194 is 49112721546.

It is not an unprimeable number, because it can be changed into a prime (64512721193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3033462 + ... + 3054654.

It is an arithmetic number, because the mean of its divisors is an integer number (4055959362).

Almost surely, 2^64512721194 is an apocalyptic number.

64512721194 is an abundant number, since it is smaller than the sum of its proper divisors (65277978390).

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

64512721194 is a wasteful number, since it uses less digits than its factorization.

64512721194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24182.

The product of its digits is 120960, while the sum is 42.

The spelling of 64512721194 in words is "sixty-four billion, five hundred twelve million, seven hundred twenty-one thousand, one hundred ninety-four".