15561452606656 has 84 divisors (see below), whose sum is σ = 33951368354176. Its totient is φ = 7071479585280.

The previous prime is 15561452606639. The next prime is 15561452606671. The reversal of 15561452606656 is 65660625416551.

It is a happy number.

15561452606656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 15561452606656.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28639201 + ... + 29177503.

Almost surely, 2^{15561452606656} is an apocalyptic number.

15561452606656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15561452606656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16975684177088).

15561452606656 is an abundant number, since it is smaller than the sum of its proper divisors (18389915747520).

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

15561452606656 is a wasteful number, since it uses less digits than its factorization.

15561452606656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542070 (or 542049 counting only the distinct ones).

The product of its (nonzero) digits is 38880000, while the sum is 58.

The spelling of 15561452606656 in words is "fifteen trillion, five hundred sixty-one billion, four hundred fifty-two million, six hundred six thousand, six hundred fifty-six".