2556869894 has 16 divisors (see below), whose sum is σ = 3960407040. Its totient is φ = 1236763080.

The previous prime is 2556869891. The next prime is 2556869897. The reversal of 2556869894 is 4989686552.

It is an interprime number because it is at equal distance from previous prime (2556869891) and next prime (2556869897).

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556869891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239237 + ... + 249695.

It is an arithmetic number, because the mean of its divisors is an integer number (247525440).

Almost surely, 2^2556869894 is an apocalyptic number.

2556869894 is a deficient number, since it is larger than the sum of its proper divisors (1403537146).

2556869894 is a wasteful number, since it uses less digits than its factorization.

2556869894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14435.

The product of its digits is 37324800, while the sum is 62.

The square root of 2556869894 is about 50565.5010258971. The cubic root of 2556869894 is about 1367.4229876631.

The spelling of 2556869894 in words is "two billion, five hundred fifty-six million, eight hundred sixty-nine thousand, eight hundred ninety-four".