2556611807807 has 16 divisors (see below), whose sum is σ = 2750277849120. Its totient is φ = 2367903163392.

The previous prime is 2556611807803. The next prime is 2556611807821. The reversal of 2556611807807 is 7087081166552.

It is not a de Polignac number, because 2556611807807 - 2² = 2556611807803 is a prime.

It is a super-2 number, since 2×2556611807807² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556611807801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1775432 + ... + 2874957.

It is an arithmetic number, because the mean of its divisors is an integer number (171892365570).

Almost surely, 2^{2556611807807} is an apocalyptic number.

2556611807807 is a deficient number, since it is larger than the sum of its proper divisors (193666041313).

2556611807807 is a wasteful number, since it uses less digits than its factorization.

2556611807807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4650922.

The product of its (nonzero) digits is 5644800, while the sum is 56.

The spelling of 2556611807807 in words is "two trillion, five hundred fifty-six billion, six hundred eleven million, eight hundred seven thousand, eight hundred seven".