166212423790 has 128 divisors (see below), whose sum is σ = 363234336768. Its totient is φ = 53548439040.

The previous prime is 166212423779. The next prime is 166212423823. The reversal of 166212423790 is 97324212661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45201432 + ... + 45205108.

It is an arithmetic number, because the mean of its divisors is an integer number (2837768256).

Almost surely, 2^166212423790 is an apocalyptic number.

166212423790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166212423790 is an abundant number, since it is smaller than the sum of its proper divisors (197021912978).

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

166212423790 is a wasteful number, since it uses less digits than its factorization.

166212423790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 166212423790 in words is "one hundred sixty-six billion, two hundred twelve million, four hundred twenty-three thousand, seven hundred ninety".