2166166707860 has 24 divisors (see below), whose sum is σ = 4549025045376. Its totient is φ = 866452405280.

The previous prime is 2166166707781. The next prime is 2166166707863. The reversal of 2166166707860 is 687076616612.

It is a junction number, because it is equal to n+sod(n) for n = 2166166707796 and 2166166707805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166166707863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397145 + ... + 2118975.

It is an arithmetic number, because the mean of its divisors is an integer number (189542710224).

Almost surely, 2^{2166166707860} is an apocalyptic number.

2166166707860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166166707860 is an abundant number, since it is smaller than the sum of its proper divisors (2382858337516).

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

2166166707860 is a wasteful number, since it uses less digits than its factorization.

2166166707860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784743 (or 1784741 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 2166166707860 in words is "two trillion, one hundred sixty-six billion, one hundred sixty-six million, seven hundred seven thousand, eight hundred sixty".