2166036864 has 32 divisors (see below), whose sum is σ = 5753536440. Its totient is φ = 722012160.

The previous prime is 2166036857. The next prime is 2166036871. The reversal of 2166036864 is 4686306612.

It is an interprime number because it is at equal distance from previous prime (2166036857) and next prime (2166036871).

It is a tau number, because it is divible by the number of its divisors (32).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2819977 + ... + 2820744.

Almost surely, 2^2166036864 is an apocalyptic number.

2166036864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2166036864 is an abundant number, since it is smaller than the sum of its proper divisors (3587499576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166036864 is an equidigital number, since it uses as much as digits as its factorization.

2166036864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5640738 (or 5640726 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 2166036864 is about 46540.7011550105. The cubic root of 2166036864 is about 1293.8639558145.

The spelling of 2166036864 in words is "two billion, one hundred sixty-six million, thirty-six thousand, eight hundred sixty-four".