2556278684 has 6 divisors (see below), whose sum is σ = 4473487704. Its totient is φ = 1278139340.

The previous prime is 2556278657. The next prime is 2556278687. The reversal of 2556278684 is 4868726552.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 319534832 + ... + 319534839.

It is an arithmetic number, because the mean of its divisors is an integer number (745581284).

Almost surely, 2^2556278684 is an apocalyptic number.

It is an amenable number.

2556278684 is a deficient number, since it is larger than the sum of its proper divisors (1917209020).

2556278684 is a wasteful number, since it uses less digits than its factorization.

2556278684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639069675 (or 639069673 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 53.

The square root of 2556278684 is about 50559.6547060994. The cubic root of 2556278684 is about 1367.3175858116.

The spelling of 2556278684 in words is "two billion, five hundred fifty-six million, two hundred seventy-eight thousand, six hundred eighty-four".