2556780994 has 16 divisors (see below), whose sum is σ = 4070438136. Its totient is φ = 1200326400.

The previous prime is 2556780979. The next prime is 2556781009. The reversal of 2556780994 is 4990876552.

It is an interprime number because it is at equal distance from previous prime (2556780979) and next prime (2556781009).

It can be written as a sum of positive squares in 4 ways, for example, as 2144893969 + 411887025 = 46313^2 + 20295^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74997 + ... + 103624.

Almost surely, 2^2556780994 is an apocalyptic number.

2556780994 is a deficient number, since it is larger than the sum of its proper divisors (1513657142).

2556780994 is a wasteful number, since it uses less digits than its factorization.

2556780994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179061.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The square root of 2556780994 is about 50564.6219604181. The cubic root of 2556780994 is about 1367.4071394688.

The spelling of 2556780994 in words is "two billion, five hundred fifty-six million, seven hundred eighty thousand, nine hundred ninety-four".