2166044251 has 32 divisors (see below), whose sum is σ = 2735447040. Its totient is φ = 1672285824.

The previous prime is 2166044233. The next prime is 2166044263. The reversal of 2166044251 is 1524406612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2166044251 - 2⁷ = 2166044123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166044281) 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, 527161 + ... + 531253.

It is an arithmetic number, because the mean of its divisors is an integer number (85482720).

Almost surely, 2^2166044251 is an apocalyptic number.

2166044251 is a deficient number, since it is larger than the sum of its proper divisors (569402789).

2166044251 is a wasteful number, since it uses less digits than its factorization.

2166044251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 2166044251 is about 46540.7805155865. The cubic root of 2166044251 is about 1293.8654266669.

The spelling of 2166044251 in words is "two billion, one hundred sixty-six million, forty-four thousand, two hundred fifty-one".