255155557 has 2 divisors, whose sum is σ = 255155558. Its totient is φ = 255155556.

The previous prime is 255155531. The next prime is 255155569. The reversal of 255155557 is 755551552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133957476 + 121198081 = 11574^2 + 11009^2 .

It is a cyclic number.

It is not a de Polignac number, because 255155557 - 2⁷ = 255155429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255155597) 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 as a sum of consecutive naturals, namely, 127577778 + 127577779.

It is an arithmetic number, because the mean of its divisors is an integer number (127577779).

Almost surely, 2^255155557 is an apocalyptic number.

It is an amenable number.

255155557 is a deficient number, since it is larger than the sum of its proper divisors (1).

255155557 is an equidigital number, since it uses as much as digits as its factorization.

255155557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 218750, while the sum is 40.

The square root of 255155557 is about 15973.5893586883. The cubic root of 255155557 is about 634.2614904190.

The spelling of 255155557 in words is "two hundred fifty-five million, one hundred fifty-five thousand, five hundred fifty-seven".