2125661164 has 24 divisors (see below), whose sum is σ = 4296792528. Its totient is φ = 909373440.

The previous prime is 2125661149. The next prime is 2125661171. The reversal of 2125661164 is 4611665212.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1420149 + ... + 1421644.

It is an arithmetic number, because the mean of its divisors is an integer number (179033022).

Almost surely, 2^2125661164 is an apocalyptic number.

It is an amenable number.

2125661164 is an abundant number, since it is smaller than the sum of its proper divisors (2171131364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2125661164 is a wasteful number, since it uses less digits than its factorization.

2125661164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841825 (or 2841823 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 2125661164 is about 46104.8930591971. The cubic root of 2125661164 is about 1285.7741178811.

The spelling of 2125661164 in words is "two billion, one hundred twenty-five million, six hundred sixty-one thousand, one hundred sixty-four".