2166520500 has 96 divisors (see below), whose sum is σ = 7009941120. Its totient is φ = 577735200.

The previous prime is 2166520493. The next prime is 2166520501. The reversal of 2166520500 is 50256612.

2166520500 is a `hidden beast` number, since 2 + 1 + 6 + 652 + 0 + 5 + 0 + 0 = 666.

It is a super-2 number, since 2×2166520500² = 9387622153840500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166520501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66742 + ... + 93741.

It is an arithmetic number, because the mean of its divisors is an integer number (73020220).

Almost surely, 2^2166520500 is an apocalyptic number.

2166520500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166520500 is an abundant number, since it is smaller than the sum of its proper divisors (4843420620).

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

2166520500 is a wasteful number, since it uses less digits than its factorization.

2166520500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160511 (or 160493 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 2166520500 is about 46545.8967042209. The cubic root of 2166520500 is about 1293.9602472843.

The spelling of 2166520500 in words is "two billion, one hundred sixty-six million, five hundred twenty thousand, five hundred".