255785157 has 6 divisors (see below), whose sum is σ = 369467462. Its totient is φ = 170523432.

The previous prime is 255785143. The next prime is 255785203. The reversal of 255785157 is 751587552.

255785157 is a `hidden beast` number, since 2 + 557 + 85 + 15 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 174081636 + 81703521 = 13194^2 + 9039^2 .

It is not a de Polignac number, because 255785157 - 2⁴ = 255785141 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 (255785137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14210278 + ... + 14210295.

Almost surely, 2^255785157 is an apocalyptic number.

It is an amenable number.

255785157 is a deficient number, since it is larger than the sum of its proper divisors (113682305).

255785157 is a wasteful number, since it uses less digits than its factorization.

255785157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28420579 (or 28420576 counting only the distinct ones).

The product of its digits is 490000, while the sum is 45.

The square root of 255785157 is about 15993.2847470431. The cubic root of 255785157 is about 634.7827450305.

The spelling of 255785157 in words is "two hundred fifty-five million, seven hundred eighty-five thousand, one hundred fifty-seven".