255606607021 has 2 divisors, whose sum is σ = 255606607022. Its totient is φ = 255606607020.

The previous prime is 255606607013. The next prime is 255606607027. The reversal of 255606607021 is 120706606552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212295170025 + 43311436996 = 460755^2 + 208114^2 .

It is a cyclic number.

It is not a de Polignac number, because 255606607021 - 2³ = 255606607013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255606607027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127803303510 + 127803303511.

It is an arithmetic number, because the mean of its divisors is an integer number (127803303511).

Almost surely, 2^255606607021 is an apocalyptic number.

It is an amenable number.

255606607021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255606607021 is an equidigital number, since it uses as much as digits as its factorization.

255606607021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 255606607021 in words is "two hundred fifty-five billion, six hundred six million, six hundred seven thousand, twenty-one".