2556622761 has 32 divisors (see below), whose sum is σ = 4258814976. Its totient is φ = 1325352000.

The previous prime is 2556622723. The next prime is 2556622769. The reversal of 2556622761 is 1672266552.

It is not a de Polignac number, because 2556622761 - 2¹³ = 2556614569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2556622769) 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 31 ways as a sum of consecutive naturals, for example, 102151 + ... + 124691.

It is an arithmetic number, because the mean of its divisors is an integer number (133087968).

Almost surely, 2^2556622761 is an apocalyptic number.

2556622761 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2556622761 is a deficient number, since it is larger than the sum of its proper divisors (1702192215).

2556622761 is a wasteful number, since it uses less digits than its factorization.

2556622761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23053.

The product of its digits is 302400, while the sum is 42.

The square root of 2556622761 is about 50563.0572750501. The cubic root of 2556622761 is about 1367.3789303785.

The spelling of 2556622761 in words is "two billion, five hundred fifty-six million, six hundred twenty-two thousand, seven hundred sixty-one".