655880813 has 24 divisors (see below), whose sum is σ = 775763520. Its totient is φ = 543168000.

The previous prime is 655880767. The next prime is 655880839. The reversal of 655880813 is 318088556.

It is not a de Polignac number, because 655880813 - 2⁶ = 655880749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655880843) 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, 1635413 + ... + 1635813.

It is an arithmetic number, because the mean of its divisors is an integer number (32323480).

Almost surely, 2^655880813 is an apocalyptic number.

It is an amenable number.

655880813 is a deficient number, since it is larger than the sum of its proper divisors (119882707).

655880813 is a wasteful number, since it uses less digits than its factorization.

655880813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 588 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 44.

The square root of 655880813 is about 25610.1701087673. The cubic root of 655880813 is about 868.8436714345.

The spelling of 655880813 in words is "six hundred fifty-five million, eight hundred eighty thousand, eight hundred thirteen".