2161580125 has 16 divisors (see below), whose sum is σ = 2839636800. Its totient is φ = 1638248400.

The previous prime is 2161580119. The next prime is 2161580129. The reversal of 2161580125 is 5210851612.

It is not a de Polignac number, because 2161580125 - 2⁵ = 2161580093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161580129) 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, 452695 + ... + 457444.

It is an arithmetic number, because the mean of its divisors is an integer number (177477300).

Almost surely, 2^2161580125 is an apocalyptic number.

2161580125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2161580125 is a deficient number, since it is larger than the sum of its proper divisors (678056675).

2161580125 is an equidigital number, since it uses as much as digits as its factorization.

2161580125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910173 (or 910163 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 2161580125 is about 46492.7964850470. The cubic root of 2161580125 is about 1292.9759479387.

The spelling of 2161580125 in words is "two billion, one hundred sixty-one million, five hundred eighty thousand, one hundred twenty-five".