2556172399 has 8 divisors (see below), whose sum is σ = 2804672592. Its totient is φ = 2310359040.

The previous prime is 2556172397. The next prime is 2556172403. The reversal of 2556172399 is 9932716552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2556172399 - 2¹ = 2556172397 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 (2556172397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669714 + ... + 673519.

It is an arithmetic number, because the mean of its divisors is an integer number (350584074).

Almost surely, 2^2556172399 is an apocalyptic number.

2556172399 is a deficient number, since it is larger than the sum of its proper divisors (248500193).

2556172399 is a wasteful number, since it uses less digits than its factorization.

2556172399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343417.

The product of its digits is 1020600, while the sum is 49.

The square root of 2556172399 is about 50558.6036100682. The cubic root of 2556172399 is about 1367.2986354308.

The spelling of 2556172399 in words is "two billion, five hundred fifty-six million, one hundred seventy-two thousand, three hundred ninety-nine".