16561155017 has 16 divisors (see below), whose sum is σ = 18666754560. Its totient is φ = 14556460800.

The previous prime is 16561154999. The next prime is 16561155043. The reversal of 16561155017 is 71055116561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16561155017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16561155097) 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, 356273 + ... + 400065.

It is an arithmetic number, because the mean of its divisors is an integer number (1166672160).

Almost surely, 2^16561155017 is an apocalyptic number.

It is an amenable number.

16561155017 is a deficient number, since it is larger than the sum of its proper divisors (2105599543).

16561155017 is a wasteful number, since it uses less digits than its factorization.

16561155017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44944.

The product of its (nonzero) digits is 31500, while the sum is 38.

The spelling of 16561155017 in words is "sixteen billion, five hundred sixty-one million, one hundred fifty-five thousand, seventeen".