653939656 has 8 divisors (see below), whose sum is σ = 1226136870. Its totient is φ = 326969824.

The previous prime is 653939639. The next prime is 653939659. The reversal of 653939656 is 656939356.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 453264100 + 200675556 = 21290^2 + 14166^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (653939659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40871221 + ... + 40871236.

Almost surely, 2^653939656 is an apocalyptic number.

It is an amenable number.

653939656 is a deficient number, since it is larger than the sum of its proper divisors (572197214).

653939656 is a wasteful number, since it uses less digits than its factorization.

653939656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81742463 (or 81742459 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 52.

The square root of 653939656 is about 25572.2438593096. The cubic root of 653939656 is about 867.9856758238.

The spelling of 653939656 in words is "six hundred fifty-three million, nine hundred thirty-nine thousand, six hundred fifty-six".