2166515020 has 48 divisors (see below), whose sum is σ = 4947536160. Its totient is φ = 793580544.

The previous prime is 2166515017. The next prime is 2166515023. The reversal of 2166515020 is 205156612.

It is an interprime number because it is at equal distance from previous prime (2166515017) and next prime (2166515023).

It is a self number, because there is not a number n which added to its sum of digits gives 2166515020.

It is not an unprimeable number, because it can be changed into a prime (2166515023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73530 + ... + 98689.

It is an arithmetic number, because the mean of its divisors is an integer number (103073670).

Almost surely, 2^2166515020 is an apocalyptic number.

2166515020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166515020 is an abundant number, since it is smaller than the sum of its proper divisors (2781021140).

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

2166515020 is a wasteful number, since it uses less digits than its factorization.

2166515020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172282 (or 172280 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 2166515020 is about 46545.8378375554. The cubic root of 2166515020 is about 1293.9591563018.

The spelling of 2166515020 in words is "two billion, one hundred sixty-six million, five hundred fifteen thousand, twenty".