255545142661 has 2 divisors, whose sum is σ = 255545142662. Its totient is φ = 255545142660.

The previous prime is 255545142647. The next prime is 255545142683. The reversal of 255545142661 is 166241545552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228967992036 + 26577150625 = 478506^2 + 163025^2 .

It is a cyclic number.

It is not a de Polignac number, because 255545142661 - 2²¹ = 255543045509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255545142161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127772571330 + 127772571331.

It is an arithmetic number, because the mean of its divisors is an integer number (127772571331).

Almost surely, 2^255545142661 is an apocalyptic number.

It is an amenable number.

255545142661 is a deficient number, since it is larger than the sum of its proper divisors (1).

255545142661 is an equidigital number, since it uses as much as digits as its factorization.

255545142661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440000, while the sum is 46.

The spelling of 255545142661 in words is "two hundred fifty-five billion, five hundred forty-five million, one hundred forty-two thousand, six hundred sixty-one".