16561184057 has 4 divisors (see below), whose sum is σ = 18066746256. Its totient is φ = 15055621860.

The previous prime is 16561183993. The next prime is 16561184071. The reversal of 16561184057 is 75048116561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16561184057 - 2⁶ = 16561183993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16561183999 and 16561184017.

It is not an unprimeable number, because it can be changed into a prime (16561174057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752781083 + ... + 752781104.

It is an arithmetic number, because the mean of its divisors is an integer number (4516686564).

Almost surely, 2^16561184057 is an apocalyptic number.

It is an amenable number.

16561184057 is a deficient number, since it is larger than the sum of its proper divisors (1505562199).

16561184057 is a wasteful number, since it uses less digits than its factorization.

16561184057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505562198.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 16561184057 in words is "sixteen billion, five hundred sixty-one million, one hundred eighty-four thousand, fifty-seven".