655597901 has 12 divisors (see below), whose sum is σ = 763347420. Its totient is φ = 561415680.

The previous prime is 655597871. The next prime is 655597903. The reversal of 655597901 is 109795556.

It can be written as a sum of positive squares in 2 ways, for example, as 438064900 + 217533001 = 20930^2 + 14749^2 .

It is not a de Polignac number, because 655597901 - 2²⁶ = 588489037 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 (655597903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52205 + ... + 63533.

It is an arithmetic number, because the mean of its divisors is an integer number (63612285).

Almost surely, 2^655597901 is an apocalyptic number.

It is an amenable number.

655597901 is a deficient number, since it is larger than the sum of its proper divisors (107749519).

655597901 is a wasteful number, since it uses less digits than its factorization.

655597901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12524 (or 12517 counting only the distinct ones).

The product of its (nonzero) digits is 425250, while the sum is 47.

The square root of 655597901 is about 25604.6460823031. The cubic root of 655597901 is about 868.7187291955.

The spelling of 655597901 in words is "six hundred fifty-five million, five hundred ninety-seven thousand, nine hundred one".