655918407 has 12 divisors (see below), whose sum is σ = 965314584. Its totient is φ = 429028080.

The previous prime is 655918387. The next prime is 655918423. The reversal of 655918407 is 704819556.

It is not a de Polignac number, because 655918407 - 2⁷ = 655918279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655918427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 687069 + ... + 688022.

It is an arithmetic number, because the mean of its divisors is an integer number (80442882).

Almost surely, 2^655918407 is an apocalyptic number.

655918407 is a deficient number, since it is larger than the sum of its proper divisors (309396177).

655918407 is a wasteful number, since it uses less digits than its factorization.

655918407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375150 (or 1375147 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 655918407 is about 25610.9040644800. The cubic root of 655918407 is about 868.8602713432.

The spelling of 655918407 in words is "six hundred fifty-five million, nine hundred eighteen thousand, four hundred seven".