172666806 has 16 divisors (see below), whose sum is σ = 371897904. Its totient is φ = 53128224.

The previous prime is 172666799. The next prime is 172666829. The reversal of 172666806 is 608666271.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106761 + ... + 1106916.

It is an arithmetic number, because the mean of its divisors is an integer number (23243619).

Almost surely, 2^172666806 is an apocalyptic number.

172666806 is an abundant number, since it is smaller than the sum of its proper divisors (199231098).

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

172666806 is a wasteful number, since it uses less digits than its factorization.

172666806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213695.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 172666806 is about 13140.2741980523. The cubic root of 172666806 is about 556.8475140393.

The spelling of 172666806 in words is "one hundred seventy-two million, six hundred sixty-six thousand, eight hundred six".