2557166839 has 4 divisors (see below), whose sum is σ = 2557862224. Its totient is φ = 2556471456.

The previous prime is 2557166797. The next prime is 2557166861. The reversal of 2557166839 is 9386617552.

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

It is a cyclic number.

It is not a de Polignac number, because 2557166839 - 2¹⁹ = 2556642551 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 (2557166869) 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, 342147 + ... + 349540.

It is an arithmetic number, because the mean of its divisors is an integer number (639465556).

Almost surely, 2^2557166839 is an apocalyptic number.

2557166839 is a deficient number, since it is larger than the sum of its proper divisors (695385).

2557166839 is an equidigital number, since it uses as much as digits as its factorization.

2557166839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695384.

The product of its digits is 2721600, while the sum is 52.

The square root of 2557166839 is about 50568.4371817046. The cubic root of 2557166839 is about 1367.4759213565.

The spelling of 2557166839 in words is "two billion, five hundred fifty-seven million, one hundred sixty-six thousand, eight hundred thirty-nine".