655691013 has 48 divisors (see below), whose sum is σ = 1012078080. Its totient is φ = 408412800.

The previous prime is 655690963. The next prime is 655691027. The reversal of 655691013 is 310196556.

655691013 is a `hidden beast` number, since 6 + 556 + 91 + 0 + 13 = 666.

It is not a de Polignac number, because 655691013 - 2¹⁰ = 655689989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655691033) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1003795 + ... + 1004447.

It is an arithmetic number, because the mean of its divisors is an integer number (21084960).

Almost surely, 2^655691013 is an apocalyptic number.

It is an amenable number.

655691013 is a deficient number, since it is larger than the sum of its proper divisors (356387067).

655691013 is a wasteful number, since it uses less digits than its factorization.

655691013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 807 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 655691013 is about 25606.4642815052. The cubic root of 655691013 is about 868.7598541539.

The spelling of 655691013 in words is "six hundred fifty-five million, six hundred ninety-one thousand, thirteen".