2556872665 has 8 divisors (see below), whose sum is σ = 3139602048. Its totient is φ = 1997928240.

The previous prime is 2556872663. The next prime is 2556872677. The reversal of 2556872665 is 5662786552.

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

It is not a de Polignac number, because 2556872665 - 2¹ = 2556872663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556872663) 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 7 ways as a sum of consecutive naturals, for example, 5946001 + ... + 5946430.

It is an arithmetic number, because the mean of its divisors is an integer number (392450256).

Almost surely, 2^2556872665 is an apocalyptic number.

It is an amenable number.

2556872665 is a deficient number, since it is larger than the sum of its proper divisors (582729383).

2556872665 is a wasteful number, since it uses less digits than its factorization.

2556872665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11892479.

The product of its digits is 6048000, while the sum is 52.

The square root of 2556872665 is about 50565.5284259939. The cubic root of 2556872665 is about 1367.4234816431.

The spelling of 2556872665 in words is "two billion, five hundred fifty-six million, eight hundred seventy-two thousand, six hundred sixty-five".