2161565703 has 32 divisors (see below), whose sum is σ = 3506849280. Its totient is φ = 1305011520.

The previous prime is 2161565687. The next prime is 2161565711. The reversal of 2161565703 is 3075651612.

2161565703 is a `hidden beast` number, since 21 + 6 + 1 + 565 + 70 + 3 = 666.

It is not a de Polignac number, because 2161565703 - 2⁴ = 2161565687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161565773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64275 + ... + 91947.

It is an arithmetic number, because the mean of its divisors is an integer number (109589040).

Almost surely, 2^2161565703 is an apocalyptic number.

2161565703 is a deficient number, since it is larger than the sum of its proper divisors (1345283577).

2161565703 is a wasteful number, since it uses less digits than its factorization.

2161565703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27956 (or 27950 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 2161565703 is about 46492.6413854924. The cubic root of 2161565703 is about 1292.9730723663.

The spelling of 2161565703 in words is "two billion, one hundred sixty-one million, five hundred sixty-five thousand, seven hundred three".