2166548805 has 24 divisors (see below), whose sum is σ = 3797553240. Its totient is φ = 1142507520.

The previous prime is 2166548767. The next prime is 2166548831. The reversal of 2166548805 is 5088456612.

2166548805 is a `hidden beast` number, since 2 + 166 + 5 + 488 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 77053284 + 2089495521 = 8778^2 + 45711^2 .

It is not a de Polignac number, because 2166548805 - 2¹⁰ = 2166547781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266476 + ... + 274485.

It is an arithmetic number, because the mean of its divisors is an integer number (158231385).

Almost surely, 2^2166548805 is an apocalyptic number.

It is an amenable number.

2166548805 is a deficient number, since it is larger than the sum of its proper divisors (1631004435).

2166548805 is a wasteful number, since it uses less digits than its factorization.

2166548805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541061 (or 541058 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 2166548805 is about 46546.2007579566. The cubic root of 2166548805 is about 1293.9658823392.

The spelling of 2166548805 in words is "two billion, one hundred sixty-six million, five hundred forty-eight thousand, eight hundred five".