655340860921 has 24 divisors (see below), whose sum is σ = 702749692800. Its totient is φ = 609433287840.

The previous prime is 655340860847. The next prime is 655340860939. The reversal of 655340860921 is 129068043556.

It is not a de Polignac number, because 655340860921 - 2²⁷ = 655206643193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655340860961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47547051 + ... + 47560831.

It is an arithmetic number, because the mean of its divisors is an integer number (29281237200).

Almost surely, 2^655340860921 is an apocalyptic number.

It is an amenable number.

655340860921 is a deficient number, since it is larger than the sum of its proper divisors (47408831879).

655340860921 is a wasteful number, since it uses less digits than its factorization.

655340860921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14637 (or 14578 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 655340860921 in words is "six hundred fifty-five billion, three hundred forty million, eight hundred sixty thousand, nine hundred twenty-one".