172389800257 has 4 divisors (see below), whose sum is σ = 172392144516. Its totient is φ = 172387456000.

The previous prime is 172389800221. The next prime is 172389800263. The reversal of 172389800257 is 752008983271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 154100213136 + 18289587121 = 392556^2 + 135239^2 .

It is a cyclic number.

It is not a de Polignac number, because 172389800257 - 2³⁵ = 138030061889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172389800287) 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, 1058128 + ... + 1210129.

It is an arithmetic number, because the mean of its divisors is an integer number (43098036129).

Almost surely, 2^172389800257 is an apocalyptic number.

It is an amenable number.

172389800257 is a deficient number, since it is larger than the sum of its proper divisors (2344259).

172389800257 is an equidigital number, since it uses as much as digits as its factorization.

172389800257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344258.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 172389800257 in words is "one hundred seventy-two billion, three hundred eighty-nine million, eight hundred thousand, two hundred fifty-seven".