2166554263 has 4 divisors (see below), whose sum is σ = 2202071608. Its totient is φ = 2131036920.

The previous prime is 2166554261. The next prime is 2166554303. The reversal of 2166554263 is 3624556612.

It is a happy number.

2166554263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166554263 - 2¹ = 2166554261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166554261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17758581 + ... + 17758702.

It is an arithmetic number, because the mean of its divisors is an integer number (550517902).

Almost surely, 2^2166554263 is an apocalyptic number.

2166554263 is a deficient number, since it is larger than the sum of its proper divisors (35517345).

2166554263 is an equidigital number, since it uses as much as digits as its factorization.

2166554263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35517344.

The product of its digits is 259200, while the sum is 40.

The square root of 2166554263 is about 46546.2593878391. The cubic root of 2166554263 is about 1293.9669689305.

The spelling of 2166554263 in words is "two billion, one hundred sixty-six million, five hundred fifty-four thousand, two hundred sixty-three".