172221466 has 4 divisors (see below), whose sum is σ = 258332202. Its totient is φ = 86110732.

The previous prime is 172221457. The next prime is 172221473. The reversal of 172221466 is 664122271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 166797225 + 5424241 = 12915^2 + 2329^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43055365 + ... + 43055368.

Almost surely, 2^172221466 is an apocalyptic number.

172221466 is a deficient number, since it is larger than the sum of its proper divisors (86110736).

172221466 is an equidigital number, since it uses as much as digits as its factorization.

172221466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86110735.

The product of its digits is 8064, while the sum is 31.

The square root of 172221466 is about 13123.3176445592. The cubic root of 172221466 is about 556.3683638871.

The spelling of 172221466 in words is "one hundred seventy-two million, two hundred twenty-one thousand, four hundred sixty-six".