172007666 has 16 divisors (see below), whose sum is σ = 273491640. Its totient is φ = 80855040.

The previous prime is 172007659. The next prime is 172007681. The reversal of 172007666 is 666700271.

It can be written as a sum of positive squares in 4 ways, for example, as 153041641 + 18966025 = 12371^2 + 4355^2 .

It is a Curzon 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, 36146 + ... + 40626.

Almost surely, 2^172007666 is an apocalyptic number.

172007666 is a deficient number, since it is larger than the sum of its proper divisors (101483974).

172007666 is a wasteful number, since it uses less digits than its factorization.

172007666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5629.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 172007666 is about 13115.1693088576. The cubic root of 172007666 is about 556.1380387210.

The spelling of 172007666 in words is "one hundred seventy-two million, seven thousand, six hundred sixty-six".