2166123015 has 24 divisors (see below), whose sum is σ = 4290987168. Its totient is φ = 990227520.

The previous prime is 2166123007. The next prime is 2166123031. The reversal of 2166123015 is 5103216612.

2166123015 is a `hidden beast` number, since 2 + 1 + 6 + 612 + 30 + 15 = 666.

It is not a de Polignac number, because 2166123015 - 2³ = 2166123007 is a prime.

It is a super-2 number, since 2×2166123015² = 9384177832225380450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2166123015.

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, 3437976 + ... + 3438605.

It is an arithmetic number, because the mean of its divisors is an integer number (178791132).

Almost surely, 2^2166123015 is an apocalyptic number.

2166123015 is a deficient number, since it is larger than the sum of its proper divisors (2124864153).

2166123015 is a wasteful number, since it uses less digits than its factorization.

2166123015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876599 (or 6876596 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2166123015 is about 46541.6266905230. The cubic root of 2166123015 is about 1293.8811094462.

Adding to 2166123015 its reverse (5103216612), we get a palindrome (7269339627).

The spelling of 2166123015 in words is "two billion, one hundred sixty-six million, one hundred twenty-three thousand, fifteen".