2166265577 has 16 divisors (see below), whose sum is σ = 2568168960. Its totient is φ = 1787825088.

The previous prime is 2166265571. The next prime is 2166265609. The reversal of 2166265577 is 7755626612.

It is not a de Polignac number, because 2166265577 - 2⁴ = 2166265561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166265571) 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, 59963 + ... + 89039.

It is an arithmetic number, because the mean of its divisors is an integer number (160510560).

Almost surely, 2^2166265577 is an apocalyptic number.

It is an amenable number.

2166265577 is a deficient number, since it is larger than the sum of its proper divisors (401903383).

2166265577 is a wasteful number, since it uses less digits than its factorization.

2166265577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29480.

The product of its digits is 1058400, while the sum is 47.

The square root of 2166265577 is about 46543.1582190122. The cubic root of 2166265577 is about 1293.9094941425.

The spelling of 2166265577 in words is "two billion, one hundred sixty-six million, two hundred sixty-five thousand, five hundred seventy-seven".