655681617 has 12 divisors (see below), whose sum is σ = 949147264. Its totient is φ = 436174200.

The previous prime is 655681613. The next prime is 655681639. The reversal of 655681617 is 716186556.

655681617 is a `hidden beast` number, since 6 + 556 + 81 + 6 + 17 = 666.

It is not a de Polignac number, because 655681617 - 2² = 655681613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655681613) 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, 74509 + ... + 82842.

Almost surely, 2^655681617 is an apocalyptic number.

It is an amenable number.

655681617 is a deficient number, since it is larger than the sum of its proper divisors (293465647).

655681617 is a wasteful number, since it uses less digits than its factorization.

655681617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157820 (or 157817 counting only the distinct ones).

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

The square root of 655681617 is about 25606.2808115509. The cubic root of 655681617 is about 868.7557043809.

The spelling of 655681617 in words is "six hundred fifty-five million, six hundred eighty-one thousand, six hundred seventeen".