321435644661 has 6 divisors (see below), whose sum is σ = 464295931190. Its totient is φ = 214290429768.

The previous prime is 321435644627. The next prime is 321435644687. The reversal of 321435644661 is 166446534123.

321435644661 is a `hidden beast` number, since 3 + 2 + 1 + 43 + 564 + 46 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 320690027025 + 745617636 = 566295^2 + 27306^2 .

It is not a de Polignac number, because 321435644661 - 2¹⁰ = 321435643637 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 (321435644161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17857535806 + ... + 17857535823.

Almost surely, 2^321435644661 is an apocalyptic number.

It is an amenable number.

321435644661 is a deficient number, since it is larger than the sum of its proper divisors (142860286529).

321435644661 is a wasteful number, since it uses less digits than its factorization.

321435644661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35715071635 (or 35715071632 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 321435644661 in words is "three hundred twenty-one billion, four hundred thirty-five million, six hundred forty-four thousand, six hundred sixty-one".