2166120506522 has 64 divisors (see below), whose sum is σ = 3784063979520. Its totient is φ = 910822401216.

The previous prime is 2166120506521. The next prime is 2166120506567. The reversal of 2166120506522 is 2256050216612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2166120506521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137323028 + ... + 137338800.

It is an arithmetic number, because the mean of its divisors is an integer number (59125999680).

Almost surely, 2^{2166120506522} is an apocalyptic number.

2166120506522 is a deficient number, since it is larger than the sum of its proper divisors (1617943472998).

2166120506522 is a wasteful number, since it uses less digits than its factorization.

2166120506522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16635.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 2166120506522 in words is "two trillion, one hundred sixty-six billion, one hundred twenty million, five hundred six thousand, five hundred twenty-two".