2166751956 has 24 divisors (see below), whose sum is σ = 5056619904. Its totient is φ = 722127040.

The previous prime is 2166751901. The next prime is 2166751987. The reversal of 2166751956 is 6591576612.

It is a congruent number.

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, 82336 + ... + 105416.

It is an arithmetic number, because the mean of its divisors is an integer number (210692496).

Almost surely, 2^2166751956 is an apocalyptic number.

It is an amenable number.

2166751956 is an abundant number, since it is smaller than the sum of its proper divisors (2889867948).

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

2166751956 is a wasteful number, since it uses less digits than its factorization.

2166751956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30911 (or 30909 counting only the distinct ones).

The product of its digits is 680400, while the sum is 48.

The square root of 2166751956 is about 46548.3829579503. The cubic root of 2166751956 is about 1294.0063248849.

The spelling of 2166751956 in words is "two billion, one hundred sixty-six million, seven hundred fifty-one thousand, nine hundred fifty-six".