166668372 has 36 divisors (see below), whose sum is σ = 453709620. Its totient is φ = 51282432.

The previous prime is 166668371. The next prime is 166668379. The reversal of 166668372 is 273866661.

166668372 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 37527876 + 129140496 = 6126^2 + 11364^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166668371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177597 + ... + 178532.

It is an arithmetic number, because the mean of its divisors is an integer number (12603045).

Almost surely, 2^166668372 is an apocalyptic number.

166668372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166668372 is an abundant number, since it is smaller than the sum of its proper divisors (287041248).

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

166668372 is a wasteful number, since it uses less digits than its factorization.

166668372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356152 (or 356147 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 166668372 is about 12910.0105344651. The cubic root of 166668372 is about 550.3230851049.

The spelling of 166668372 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, three hundred seventy-two".