255386902585 has 4 divisors (see below), whose sum is σ = 306464283108. Its totient is φ = 204309522064.

The previous prime is 255386902583. The next prime is 255386902619. The reversal of 255386902585 is 585209683552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63301050409 + 192085852176 = 251597^2 + 438276^2 .

It is a cyclic number.

It is not a de Polignac number, because 255386902585 - 2¹ = 255386902583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255386902583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25538690254 + ... + 25538690263.

It is an arithmetic number, because the mean of its divisors is an integer number (76616070777).

Almost surely, 2^255386902585 is an apocalyptic number.

It is an amenable number.

255386902585 is a deficient number, since it is larger than the sum of its proper divisors (51077380523).

255386902585 is an equidigital number, since it uses as much as digits as its factorization.

255386902585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51077380522.

The product of its (nonzero) digits is 25920000, while the sum is 58.

The spelling of 255386902585 in words is "two hundred fifty-five billion, three hundred eighty-six million, nine hundred two thousand, five hundred eighty-five".