16561626784140 has 96 divisors (see below), whose sum is σ = 46987590101760. Its totient is φ = 4358235731200.

The previous prime is 16561626784133. The next prime is 16561626784187. The reversal of 16561626784140 is 4148762616561.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4478751 + ... + 7292630.

It is an arithmetic number, because the mean of its divisors is an integer number (489454063560).

Almost surely, 2^{16561626784140} is an apocalyptic number.

16561626784140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16561626784140 is an abundant number, since it is smaller than the sum of its proper divisors (30425963317620).

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

16561626784140 is a wasteful number, since it uses less digits than its factorization.

16561626784140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11771703 (or 11771701 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 57.

The spelling of 16561626784140 in words is "sixteen trillion, five hundred sixty-one billion, six hundred twenty-six million, seven hundred eighty-four thousand, one hundred forty".