2556869942 has 16 divisors (see below), whose sum is σ = 4184745552. Its totient is φ = 1161997920.

The previous prime is 2556869929. The next prime is 2556869947. The reversal of 2556869942 is 2499686552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556869947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224948 + ... + 236040.

It is an arithmetic number, because the mean of its divisors is an integer number (261546597).

Almost surely, 2^2556869942 is an apocalyptic number.

2556869942 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2556869942 is a deficient number, since it is larger than the sum of its proper divisors (1627875610).

2556869942 is a wasteful number, since it uses less digits than its factorization.

2556869942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21583.

The product of its digits is 9331200, while the sum is 56.

The square root of 2556869942 is about 50565.5015005290. The cubic root of 2556869942 is about 1367.4229962199.

The spelling of 2556869942 in words is "two billion, five hundred fifty-six million, eight hundred sixty-nine thousand, nine hundred forty-two".