2166901851 has 16 divisors (see below), whose sum is σ = 2939213696. Its totient is φ = 1419736896.

The previous prime is 2166901843. The next prime is 2166901861. The reversal of 2166901851 is 1581096612.

It is not a de Polignac number, because 2166901851 - 2³ = 2166901843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166901861) 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, 44496 + ... + 79458.

It is an arithmetic number, because the mean of its divisors is an integer number (183700856).

Almost surely, 2^2166901851 is an apocalyptic number.

2166901851 is a deficient number, since it is larger than the sum of its proper divisors (772311845).

2166901851 is a wasteful number, since it uses less digits than its factorization.

2166901851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35322.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 2166901851 is about 46549.9930290006. The cubic root of 2166901851 is about 1294.0361638034.

The spelling of 2166901851 in words is "two billion, one hundred sixty-six million, nine hundred one thousand, eight hundred fifty-one".