2556278685 has 48 divisors (see below), whose sum is σ = 4485274560. Its totient is φ = 1346691840.

The previous prime is 2556278657. The next prime is 2556278687. The reversal of 2556278685 is 5868726552.

2556278685 is a `hidden beast` number, since 2 + 5 + 5 + 627 + 8 + 6 + 8 + 5 = 666.

It is not a de Polignac number, because 2556278685 - 2¹⁷ = 2556147613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556278687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2508106 + ... + 2509124.

It is an arithmetic number, because the mean of its divisors is an integer number (93443220).

Almost surely, 2^2556278685 is an apocalyptic number.

It is an amenable number.

2556278685 is a deficient number, since it is larger than the sum of its proper divisors (1928995875).

2556278685 is a wasteful number, since it uses less digits than its factorization.

2556278685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658 (or 1655 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The square root of 2556278685 is about 50559.6547159887. The cubic root of 2556278685 is about 1367.3175859899.

The spelling of 2556278685 in words is "two billion, five hundred fifty-six million, two hundred seventy-eight thousand, six hundred eighty-five".