653894487656 has 8 divisors (see below), whose sum is σ = 1226052164370. Its totient is φ = 326947243824.

The previous prime is 653894487629. The next prime is 653894487703. The reversal of 653894487656 is 656784498356.

It can be written as a sum of positive squares in only one way, i.e., 331004608900 + 322889878756 = 575330^2 + 568234^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 653894487656.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40868405471 + ... + 40868405486.

Almost surely, 2^653894487656 is an apocalyptic number.

It is an amenable number.

653894487656 is a deficient number, since it is larger than the sum of its proper divisors (572157676714).

653894487656 is a wasteful number, since it uses less digits than its factorization.

653894487656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81736810963 (or 81736810959 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 71.

The spelling of 653894487656 in words is "six hundred fifty-three billion, eight hundred ninety-four million, four hundred eighty-seven thousand, six hundred fifty-six".