15643656325656 has 80 divisors (see below), whose sum is σ = 44559379002600. Its totient is φ = 5126169856896.

The previous prime is 15643656325639. The next prime is 15643656325679. The reversal of 15643656325656 is 65652365634651.

It is a happy number.

15643656325656 is a `hidden beast` number, since 1 + 5 + 6 + 4 + 3 + 6 + 5 + 63 + 2 + 565 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 15643656325593 and 15643656325602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 204550285 + ... + 204626748.

Almost surely, 2^{15643656325656} is an apocalyptic number.

It is an amenable number.

15643656325656 is an abundant number, since it is smaller than the sum of its proper divisors (28915722676944).

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

15643656325656 is a wasteful number, since it uses less digits than its factorization.

15643656325656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409177110 (or 409177097 counting only the distinct ones).

The product of its digits is 349920000, while the sum is 63.

The spelling of 15643656325656 in words is "fifteen trillion, six hundred forty-three billion, six hundred fifty-six million, three hundred twenty-five thousand, six hundred fifty-six".