2555554695581 has 2 divisors, whose sum is σ = 2555554695582. Its totient is φ = 2555554695580.

The previous prime is 2555554695557. The next prime is 2555554695587. The reversal of 2555554695581 is 1855964555552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2428326939481 + 127227756100 = 1558309^2 + 356690^2 .

It is a cyclic number.

It is not a de Polignac number, because 2555554695581 - 2¹⁸ = 2555554433437 is a prime.

It is a super-2 number, since 2×2555554695581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2555554695587) 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 as a sum of consecutive naturals, namely, 1277777347790 + 1277777347791.

It is an arithmetic number, because the mean of its divisors is an integer number (1277777347791).

Almost surely, 2^{2555554695581} is an apocalyptic number.

It is an amenable number.

2555554695581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2555554695581 is an equidigital number, since it uses as much as digits as its factorization.

2555554695581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270000000, while the sum is 65.

The spelling of 2555554695581 in words is "two trillion, five hundred fifty-five billion, five hundred fifty-four million, six hundred ninety-five thousand, five hundred eighty-one".