2166071026720 has 24 divisors (see below), whose sum is σ = 5117342801004. Its totient is φ = 866428410624.

The previous prime is 2166071026711. The next prime is 2166071026727. The reversal of 2166071026720 is 276201706612.

It can be written as a sum of positive squares in 2 ways, for example, as 2164205823376 + 1865203344 = 1471124^2 + 43188^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2166071026727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6768971799 + ... + 6768972118.

Almost surely, 2^{2166071026720} is an apocalyptic number.

2166071026720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166071026720 is an abundant number, since it is smaller than the sum of its proper divisors (2951271774284).

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

2166071026720 is a wasteful number, since it uses less digits than its factorization.

2166071026720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13537943932 (or 13537943924 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 2166071026720 in words is "two trillion, one hundred sixty-six billion, seventy-one million, twenty-six thousand, seven hundred twenty".