2161504106564 has 12 divisors (see below), whose sum is σ = 4126507839888. Its totient is φ = 982501866600.

The previous prime is 2161504106561. The next prime is 2161504106653. The reversal of 2161504106564 is 4656014051612.

It is not an unprimeable number, because it can be changed into a prime (2161504106561) 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, 24562546622 + ... + 24562546709.

It is an arithmetic number, because the mean of its divisors is an integer number (343875653324).

Almost surely, 2^{2161504106564} is an apocalyptic number.

It is an amenable number.

2161504106564 is a deficient number, since it is larger than the sum of its proper divisors (1965003733324).

2161504106564 is a wasteful number, since it uses less digits than its factorization.

2161504106564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49125093346 (or 49125093344 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 2161504106564 in words is "two trillion, one hundred sixty-one billion, five hundred four million, one hundred six thousand, five hundred sixty-four".