255997709 has 16 divisors (see below), whose sum is σ = 288392640. Its totient is φ = 225192960.

The previous prime is 255997691. The next prime is 255997741. The reversal of 255997709 is 907799552.

255997709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255997709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255997769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76922 + ... + 80180.

It is an arithmetic number, because the mean of its divisors is an integer number (18024540).

Almost surely, 2^255997709 is an apocalyptic number.

It is an amenable number.

255997709 is a deficient number, since it is larger than the sum of its proper divisors (32394931).

255997709 is a wasteful number, since it uses less digits than its factorization.

255997709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500.

The product of its (nonzero) digits is 1786050, while the sum is 53.

The square root of 255997709 is about 15999.9284060898. The cubic root of 255997709 is about 634.9585266484.

The spelling of 255997709 in words is "two hundred fifty-five million, nine hundred ninety-seven thousand, seven hundred nine".