64722438817 has 8 divisors (see below), whose sum is σ = 69715054080. Its totient is φ = 59911373280.

The previous prime is 64722438787. The next prime is 64722438827. The reversal of 64722438817 is 71883422746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64722438817 - 2⁷ = 64722438689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64722438827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45386692 + ... + 45388117.

It is an arithmetic number, because the mean of its divisors is an integer number (8714381760).

Almost surely, 2^64722438817 is an apocalyptic number.

It is an amenable number.

64722438817 is a deficient number, since it is larger than the sum of its proper divisors (4992615263).

64722438817 is a wasteful number, since it uses less digits than its factorization.

64722438817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90774863.

The product of its digits is 3612672, while the sum is 52.

The spelling of 64722438817 in words is "sixty-four billion, seven hundred twenty-two million, four hundred thirty-eight thousand, eight hundred seventeen".