655621172 has 24 divisors (see below), whose sum is σ = 1182631296. Its totient is φ = 317838528.

The previous prime is 655621159. The next prime is 655621181. The reversal of 655621172 is 271126556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9653 + ... + 37475.

It is an arithmetic number, because the mean of its divisors is an integer number (49276304).

Almost surely, 2^655621172 is an apocalyptic number.

It is an amenable number.

655621172 is a deficient number, since it is larger than the sum of its proper divisors (527010124).

655621172 is a wasteful number, since it uses less digits than its factorization.

655621172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28007 (or 28005 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 655621172 is about 25605.1005075161. The cubic root of 655621172 is about 868.7290077083.

The spelling of 655621172 in words is "six hundred fifty-five million, six hundred twenty-one thousand, one hundred seventy-two".