655138656 has 72 divisors (see below), whose sum is σ = 1972656504. Its totient is φ = 205532160.

The previous prime is 655138633. The next prime is 655138657. The reversal of 655138656 is 656831556.

655138656 is a `hidden beast` number, since 6 + 5 + 513 + 86 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655138657) 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, 62010 + ... + 71801.

It is an arithmetic number, because the mean of its divisors is an integer number (27398007).

Almost surely, 2^655138656 is an apocalyptic number.

It is an amenable number.

655138656 is an abundant number, since it is smaller than the sum of its proper divisors (1317517848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655138656 is a wasteful number, since it uses less digits than its factorization.

655138656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133844 (or 133833 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 655138656 is about 25595.6765099108. The cubic root of 655138656 is about 868.5158365768.

The spelling of 655138656 in words is "six hundred fifty-five million, one hundred thirty-eight thousand, six hundred fifty-six".