255640069 has 2 divisors, whose sum is σ = 255640070. Its totient is φ = 255640068.

The previous prime is 255640039. The next prime is 255640109. The reversal of 255640069 is 960046552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165636900 + 90003169 = 12870^2 + 9487^2 .

It is a cyclic number.

It is not a de Polignac number, because 255640069 - 2⁵ = 255640037 is a prime.

It is a super-2 number, since 2×255640069² = 130703689756649522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255640039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127820034 + 127820035.

It is an arithmetic number, because the mean of its divisors is an integer number (127820035).

Almost surely, 2^255640069 is an apocalyptic number.

It is an amenable number.

255640069 is a deficient number, since it is larger than the sum of its proper divisors (1).

255640069 is an equidigital number, since it uses as much as digits as its factorization.

255640069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 255640069 is about 15988.7481999061. The cubic root of 255640069 is about 634.6627005640.

The spelling of 255640069 in words is "two hundred fifty-five million, six hundred forty thousand, sixty-nine".