2166070072720 has 60 divisors (see below), whose sum is σ = 5122918166940. Its totient is φ = 851742698752.

The previous prime is 2166070072679. The next prime is 2166070072739. The reversal of 2166070072720 is 272700706612.

It can be written as a sum of positive squares in 2 ways, for example, as 760830529536 + 1405239543184 = 872256^2 + 1185428^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3610615 + ... + 4167574.

It is an arithmetic number, because the mean of its divisors is an integer number (85381969449).

Almost surely, 2^{2166070072720} is an apocalyptic number.

2166070072720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166070072720 is an abundant number, since it is smaller than the sum of its proper divisors (2956848094220).

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

2166070072720 is an equidigital number, since it uses as much as digits as its factorization.

2166070072720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7778320 (or 7778255 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 40.

The spelling of 2166070072720 in words is "two trillion, one hundred sixty-six billion, seventy million, seventy-two thousand, seven hundred twenty".