255517617 has 16 divisors (see below), whose sum is σ = 349493760. Its totient is φ = 165955200.

The previous prime is 255517589. The next prime is 255517621. The reversal of 255517617 is 716715552.

It is not a de Polignac number, because 255517617 - 2⁶ = 255517553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255517627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144384 + ... + 146142.

It is an arithmetic number, because the mean of its divisors is an integer number (21843360).

Almost surely, 2^255517617 is an apocalyptic number.

It is an amenable number.

255517617 is a deficient number, since it is larger than the sum of its proper divisors (93976143).

255517617 is a wasteful number, since it uses less digits than its factorization.

255517617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984.

The product of its digits is 73500, while the sum is 39.

The square root of 255517617 is about 15984.9184233139. The cubic root of 255517617 is about 634.5613495653.

The spelling of 255517617 in words is "two hundred fifty-five million, five hundred seventeen thousand, six hundred seventeen".