64172317021 has 8 divisors (see below), whose sum is σ = 65138860800. Its totient is φ = 63207515280.

The previous prime is 64172317019. The next prime is 64172317031. The reversal of 64172317021 is 12071327146.

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 64172317021 - 2¹ = 64172317019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64172317031) 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, 361186 + ... + 508723.

It is an arithmetic number, because the mean of its divisors is an integer number (8142357600).

Almost surely, 2^64172317021 is an apocalyptic number.

It is an amenable number.

64172317021 is a deficient number, since it is larger than the sum of its proper divisors (966543779).

64172317021 is a wasteful number, since it uses less digits than its factorization.

64172317021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871019.

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 64172317021 in words is "sixty-four billion, one hundred seventy-two million, three hundred seventeen thousand, twenty-one".