166403172 has 24 divisors (see below), whose sum is σ = 418141696. Its totient is φ = 51200928.

The previous prime is 166403129. The next prime is 166403173. The reversal of 166403172 is 271304661.

166403172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×166403172³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (166403173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533188 + ... + 533499.

Almost surely, 2^166403172 is an apocalyptic number.

166403172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166403172 is an abundant number, since it is smaller than the sum of its proper divisors (251738524).

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

166403172 is a wasteful number, since it uses less digits than its factorization.

166403172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066707 (or 1066705 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 166403172 is about 12899.7353461224. The cubic root of 166403172 is about 550.0310417742.

The spelling of 166403172 in words is "one hundred sixty-six million, four hundred three thousand, one hundred seventy-two".