255613551 has 4 divisors (see below), whose sum is σ = 340818072. Its totient is φ = 170409032.

The previous prime is 255613549. The next prime is 255613573. The reversal of 255613551 is 155316552.

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

It is a cyclic number.

It is not a de Polignac number, because 255613551 - 2¹ = 255613549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255613531) 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, 42602256 + ... + 42602261.

It is an arithmetic number, because the mean of its divisors is an integer number (85204518).

Almost surely, 2^255613551 is an apocalyptic number.

255613551 is a deficient number, since it is larger than the sum of its proper divisors (85204521).

255613551 is an equidigital number, since it uses as much as digits as its factorization.

255613551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85204520.

The product of its digits is 22500, while the sum is 33.

The square root of 255613551 is about 15987.9189077253. The cubic root of 255613551 is about 634.6407549075.

The spelling of 255613551 in words is "two hundred fifty-five million, six hundred thirteen thousand, five hundred fifty-one".