2557172905 has 16 divisors (see below), whose sum is σ = 3514032000. Its totient is φ = 1749964032.

The previous prime is 2557172869. The next prime is 2557172909. The reversal of 2557172905 is 5092717552.

It is a happy number.

2557172905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2557172905 - 2⁹ = 2557172393 is a prime.

It is a super-2 number, since 2×2557172905² = 13078266532132278050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2557172909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55744 + ... + 90673.

It is an arithmetic number, because the mean of its divisors is an integer number (219627000).

Almost surely, 2^2557172905 is an apocalyptic number.

It is an amenable number.

2557172905 is a deficient number, since it is larger than the sum of its proper divisors (956859095).

2557172905 is a wasteful number, since it uses less digits than its factorization.

2557172905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146928.

The product of its (nonzero) digits is 220500, while the sum is 43.

The square root of 2557172905 is about 50568.4971597931. The cubic root of 2557172905 is about 1367.4770026446.

The spelling of 2557172905 in words is "two billion, five hundred fifty-seven million, one hundred seventy-two thousand, nine hundred five".