646323227621 has 8 divisors (see below), whose sum is σ = 678027283200. Its totient is φ = 615246975280.

The previous prime is 646323227611. The next prime is 646323227657. The reversal of 646323227621 is 126722323646.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646323227621 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 (646323227611) 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, 156948701 + ... + 156952818.

It is an arithmetic number, because the mean of its divisors is an integer number (84753410400).

Almost surely, 2^646323227621 is an apocalyptic number.

It is an amenable number.

646323227621 is a deficient number, since it is larger than the sum of its proper divisors (31704055579).

646323227621 is a wasteful number, since it uses less digits than its factorization.

646323227621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313901619.

The product of its digits is 870912, while the sum is 44.

The spelling of 646323227621 in words is "six hundred forty-six billion, three hundred twenty-three million, two hundred twenty-seven thousand, six hundred twenty-one".