2557172917 has 4 divisors (see below), whose sum is σ = 2753878540. Its totient is φ = 2360467296.

The previous prime is 2557172909. The next prime is 2557172921. The reversal of 2557172917 is 7192717552.

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 264582756 + 2292590161 = 16266^2 + 47881^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557172917 - 2³ = 2557172909 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 (2557172927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98352792 + ... + 98352817.

It is an arithmetic number, because the mean of its divisors is an integer number (688469635).

Almost surely, 2^2557172917 is an apocalyptic number.

It is an amenable number.

2557172917 is a deficient number, since it is larger than the sum of its proper divisors (196705623).

2557172917 is a wasteful number, since it uses less digits than its factorization.

2557172917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196705622.

The product of its digits is 308700, while the sum is 46.

The square root of 2557172917 is about 50568.4972784440. The cubic root of 2557172917 is about 1367.4770047836.

The spelling of 2557172917 in words is "two billion, five hundred fifty-seven million, one hundred seventy-two thousand, nine hundred seventeen".