320365501621 has 4 divisors (see below), whose sum is σ = 349489638144. Its totient is φ = 291241365100.

The previous prime is 320365501613. The next prime is 320365501633. The reversal of 320365501621 is 126105563023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320365501621 - 2³ = 320365501613 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 (320365501601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14562068245 + ... + 14562068266.

It is an arithmetic number, because the mean of its divisors is an integer number (87372409536).

Almost surely, 2^320365501621 is an apocalyptic number.

It is an amenable number.

320365501621 is a deficient number, since it is larger than the sum of its proper divisors (29124136523).

320365501621 is a wasteful number, since it uses less digits than its factorization.

320365501621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29124136522.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 320365501621 in words is "three hundred twenty billion, three hundred sixty-five million, five hundred one thousand, six hundred twenty-one".