172145653 has 8 divisors (see below), whose sum is σ = 178663680. Its totient is φ = 165666480.

The previous prime is 172145647. The next prime is 172145663. The reversal of 172145653 is 356541271.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172145653 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 (172145663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525 + ... + 18562.

It is an arithmetic number, because the mean of its divisors is an integer number (22332960).

Almost surely, 2^172145653 is an apocalyptic number.

It is an amenable number.

172145653 is a deficient number, since it is larger than the sum of its proper divisors (6518027).

172145653 is a wasteful number, since it uses less digits than its factorization.

172145653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19427.

The product of its digits is 25200, while the sum is 34.

The square root of 172145653 is about 13120.4288420768. The cubic root of 172145653 is about 556.2867129243.

It can be divided in two parts, 1721 and 45653, that added together give a palindrome (47374).

The spelling of 172145653 in words is "one hundred seventy-two million, one hundred forty-five thousand, six hundred fifty-three".