2661256553 has 2 divisors, whose sum is σ = 2661256554. Its totient is φ = 2661256552.

The previous prime is 2661256457. The next prime is 2661256567. The reversal of 2661256553 is 3556521662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1375890649 + 1285365904 = 37093^2 + 35852^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661256553 - 2¹⁸ = 2660994409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2661256553.

It is not a weakly prime, because it can be changed into another prime (2661256583) 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, 1330628276 + 1330628277.

It is an arithmetic number, because the mean of its divisors is an integer number (1330628277).

Almost surely, 2^2661256553 is an apocalyptic number.

It is an amenable number.

2661256553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661256553 is an equidigital number, since it uses as much as digits as its factorization.

2661256553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 41.

The square root of 2661256553 is about 51587.3681534540. The cubic root of 2661256553 is about 1385.7841229645.

The spelling of 2661256553 in words is "two billion, six hundred sixty-one million, two hundred fifty-six thousand, five hundred fifty-three".