172072666 has 8 divisors (see below), whose sum is σ = 258287040. Its totient is φ = 85976988.

The previous prime is 172072651. The next prime is 172072669. The reversal of 172072666 is 666270271.

172072666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (172072669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25956 + ... + 31903.

It is an arithmetic number, because the mean of its divisors is an integer number (32285880).

Almost surely, 2^172072666 is an apocalyptic number.

172072666 is a deficient number, since it is larger than the sum of its proper divisors (86214374).

172072666 is a wasteful number, since it uses less digits than its factorization.

172072666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59348.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 172072666 is about 13117.6471213400. The cubic root of 172072666 is about 556.2080829248.

The spelling of 172072666 in words is "one hundred seventy-two million, seventy-two thousand, six hundred sixty-six".