2161515570566 has 24 divisors (see below), whose sum is σ = 3566674965000. Its totient is φ = 981720305280.

The previous prime is 2161515570521. The next prime is 2161515570653. The reversal of 2161515570566 is 6650755151612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3273356 + ... + 3877871.

It is an arithmetic number, because the mean of its divisors is an integer number (148611456875).

Almost surely, 2^{2161515570566} is an apocalyptic number.

2161515570566 is a deficient number, since it is larger than the sum of its proper divisors (1405159394434).

2161515570566 is a wasteful number, since it uses less digits than its factorization.

2161515570566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152500 (or 7152489 counting only the distinct ones).

The product of its (nonzero) digits is 1890000, while the sum is 50.

The spelling of 2161515570566 in words is "two trillion, one hundred sixty-one billion, five hundred fifteen million, five hundred seventy thousand, five hundred sixty-six".