255566537 has 2 divisors, whose sum is σ = 255566538. Its totient is φ = 255566536.

The previous prime is 255566533. The next prime is 255566539. The reversal of 255566537 is 735665552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203091001 + 52475536 = 14251^2 + 7244^2 .

It is a cyclic number.

It is not a de Polignac number, because 255566537 - 2² = 255566533 is a prime.

Together with 255566539, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255566533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127783268 + 127783269.

It is an arithmetic number, because the mean of its divisors is an integer number (127783269).

Almost surely, 2^255566537 is an apocalyptic number.

It is an amenable number.

255566537 is a deficient number, since it is larger than the sum of its proper divisors (1).

255566537 is an equidigital number, since it uses as much as digits as its factorization.

255566537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 945000, while the sum is 44.

The square root of 255566537 is about 15986.4485424374. The cubic root of 255566537 is about 634.6018435251.

The spelling of 255566537 in words is "two hundred fifty-five million, five hundred sixty-six thousand, five hundred thirty-seven".