656663651436 has 24 divisors (see below), whose sum is σ = 1650077893744. Its totient is φ = 202050354240.

The previous prime is 656663651419. The next prime is 656663651437. The reversal of 656663651436 is 634156366656.

It is a happy number.

It is a super-2 number, since 2×656663651436² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656663651437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2104691035 + ... + 2104691346.

Almost surely, 2^656663651436 is an apocalyptic number.

It is an amenable number.

656663651436 is an abundant number, since it is smaller than the sum of its proper divisors (993414242308).

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

656663651436 is a wasteful number, since it uses less digits than its factorization.

656663651436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209382401 (or 4209382399 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 57.

The spelling of 656663651436 in words is "six hundred fifty-six billion, six hundred sixty-three million, six hundred fifty-one thousand, four hundred thirty-six".