166799185920 has 144 divisors (see below), whose sum is σ = 578096326080. Its totient is φ = 44479758336.

The previous prime is 166799185913. The next prime is 166799185933. The reversal of 166799185920 is 29581997661.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 812784 + ... + 997103.

It is an arithmetic number, because the mean of its divisors is an integer number (4014557820).

Almost surely, 2^166799185920 is an apocalyptic number.

166799185920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166799185920 is an abundant number, since it is smaller than the sum of its proper divisors (411297140160).

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

166799185920 is a wasteful number, since it uses less digits than its factorization.

166799185920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809920 (or 1809897 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 63.

The spelling of 166799185920 in words is "one hundred sixty-six billion, seven hundred ninety-nine million, one hundred eighty-five thousand, nine hundred twenty".