172273663 has 4 divisors (see below), whose sum is σ = 172695280. Its totient is φ = 171852048.

The previous prime is 172273639. The next prime is 172273669. The reversal of 172273663 is 366372271.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172273663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172273669) 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, 210195 + ... + 211012.

It is an arithmetic number, because the mean of its divisors is an integer number (43173820).

Almost surely, 2^172273663 is an apocalyptic number.

172273663 is a deficient number, since it is larger than the sum of its proper divisors (421617).

172273663 is an equidigital number, since it uses as much as digits as its factorization.

172273663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421616.

The product of its digits is 63504, while the sum is 37.

The square root of 172273663 is about 13125.3062059519. The cubic root of 172273663 is about 556.4245663780.

The spelling of 172273663 in words is "one hundred seventy-two million, two hundred seventy-three thousand, six hundred sixty-three".