166138738280 has 64 divisors (see below), whose sum is σ = 393586862400. Its totient is φ = 62941777920.

The previous prime is 166138738279. The next prime is 166138738301. The reversal of 166138738280 is 82837831661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3198920 + ... + 3250440.

It is an arithmetic number, because the mean of its divisors is an integer number (6149794725).

Almost surely, 2^166138738280 is an apocalyptic number.

166138738280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166138738280 is an abundant number, since it is smaller than the sum of its proper divisors (227448124120).

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

166138738280 is a wasteful number, since it uses less digits than its factorization.

166138738280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55794 (or 55790 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 166138738280 in words is "one hundred sixty-six billion, one hundred thirty-eight million, seven hundred thirty-eight thousand, two hundred eighty".