172230521957 has 4 divisors (see below), whose sum is σ = 185479023660. Its totient is φ = 158982020256.

The previous prime is 172230521887. The next prime is 172230521971. The reversal of 172230521957 is 759125032271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 759125032271 = 17 ⋅44654413663.

It can be written as a sum of positive squares in 2 ways, for example, as 29889568996 + 142340952961 = 172886^2 + 377281^2 .

It is a cyclic number.

It is not a de Polignac number, because 172230521957 - 2²⁴ = 172213744741 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 (172230541957) 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, 6624250832 + ... + 6624250857.

It is an arithmetic number, because the mean of its divisors is an integer number (46369755915).

Almost surely, 2^172230521957 is an apocalyptic number.

It is an amenable number.

172230521957 is a deficient number, since it is larger than the sum of its proper divisors (13248501703).

172230521957 is a wasteful number, since it uses less digits than its factorization.

172230521957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13248501702.

The product of its (nonzero) digits is 264600, while the sum is 44.

The spelling of 172230521957 in words is "one hundred seventy-two billion, two hundred thirty million, five hundred twenty-one thousand, nine hundred fifty-seven".