2166607206520 has 16 divisors (see below), whose sum is σ = 4874866214760. Its totient is φ = 866642882592.

The previous prime is 2166607206509. The next prime is 2166607206523. The reversal of 2166607206520 is 256027066612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166607206523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27082590042 + ... + 27082590121.

Almost surely, 2^{2166607206520} is an apocalyptic number.

2166607206520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166607206520 is an abundant number, since it is smaller than the sum of its proper divisors (2708259008240).

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

2166607206520 is a wasteful number, since it uses less digits than its factorization.

2166607206520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54165180174 (or 54165180170 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 2166607206520 in words is "two trillion, one hundred sixty-six billion, six hundred seven million, two hundred six thousand, five hundred twenty".