2556376987 has 4 divisors (see below), whose sum is σ = 2565474696. Its totient is φ = 2547279280.

The previous prime is 2556376981. The next prime is 2556376997. The reversal of 2556376987 is 7896736552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2556376987 - 2¹¹ = 2556374939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556376981) 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 3 ways as a sum of consecutive naturals, for example, 4548433 + ... + 4548994.

It is an arithmetic number, because the mean of its divisors is an integer number (641368674).

Almost surely, 2^2556376987 is an apocalyptic number.

2556376987 is a deficient number, since it is larger than the sum of its proper divisors (9097709).

2556376987 is an equidigital number, since it uses as much as digits as its factorization.

2556376987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9097708.

The product of its digits is 19051200, while the sum is 58.

The square root of 2556376987 is about 50560.6268454021. The cubic root of 2556376987 is about 1367.3351125519.

The spelling of 2556376987 in words is "two billion, five hundred fifty-six million, three hundred seventy-six thousand, nine hundred eighty-seven".