2556120085 has 8 divisors (see below), whose sum is σ = 3247776216. Its totient is φ = 1924608000.

The previous prime is 2556120037. The next prime is 2556120101. The reversal of 2556120085 is 5800216552.

It can be written as a sum of positive squares in 4 ways, for example, as 506385009 + 2049735076 = 22503^2 + 45274^2 .

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

It is not a de Polignac number, because 2556120085 - 2²⁵ = 2522565653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2556120085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15035916 + ... + 15036085.

It is an arithmetic number, because the mean of its divisors is an integer number (405972027).

Almost surely, 2^2556120085 is an apocalyptic number.

It is an amenable number.

2556120085 is a deficient number, since it is larger than the sum of its proper divisors (691656131).

2556120085 is a wasteful number, since it uses less digits than its factorization.

2556120085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30072023.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 2556120085 is about 50558.0862474046. The cubic root of 2556120085 is about 1367.2893077671.

The spelling of 2556120085 in words is "two billion, five hundred fifty-six million, one hundred twenty thousand, eighty-five".