16650625815561 has 16 divisors (see below), whose sum is σ = 22659471671040. Its totient is φ = 10871834762880.

The previous prime is 16650625815497. The next prime is 16650625815599. The reversal of 16650625815561 is 16551852605661.

It is not a de Polignac number, because 16650625815561 - 2⁶ = 16650625815497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16650625815361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91931425 + ... + 92112366.

It is an arithmetic number, because the mean of its divisors is an integer number (1416216979440).

Almost surely, 2^{16650625815561} is an apocalyptic number.

It is an amenable number.

16650625815561 is a deficient number, since it is larger than the sum of its proper divisors (6008845855479).

16650625815561 is a wasteful number, since it uses less digits than its factorization.

16650625815561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184044416.

The product of its (nonzero) digits is 12960000, while the sum is 57.

The spelling of 16650625815561 in words is "sixteen trillion, six hundred fifty billion, six hundred twenty-five million, eight hundred fifteen thousand, five hundred sixty-one".