64155716872 has 64 divisors (see below), whose sum is σ = 132152186880. Its totient is φ = 29015830272.

The previous prime is 64155716851. The next prime is 64155716887. The reversal of 64155716872 is 27861755146.

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 4750113 + ... + 4763599.

It is an arithmetic number, because the mean of its divisors is an integer number (2064877920).

Almost surely, 2^64155716872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64155716872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66076093440).

64155716872 is an abundant number, since it is smaller than the sum of its proper divisors (67996470008).

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

64155716872 is a wasteful number, since it uses less digits than its factorization.

64155716872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14422 (or 14418 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 52.

The spelling of 64155716872 in words is "sixty-four billion, one hundred fifty-five million, seven hundred sixteen thousand, eight hundred seventy-two".