255666009717 has 16 divisors (see below), whose sum is σ = 378854573760. Its totient is φ = 170403454800.

The previous prime is 255666009673. The next prime is 255666009719. The reversal of 255666009717 is 717900666552.

It is not a de Polignac number, because 255666009717 - 2¹¹ = 255666007669 is a prime.

It is a super-2 number, since 2×255666009717² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255666009719) 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, 1010634 + ... + 1238027.

It is an arithmetic number, because the mean of its divisors is an integer number (23678410860).

Almost surely, 2^255666009717 is an apocalyptic number.

255666009717 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

255666009717 is a deficient number, since it is larger than the sum of its proper divisors (123188564043).

255666009717 is a wasteful number, since it uses less digits than its factorization.

255666009717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252881 (or 2252875 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 54.

The spelling of 255666009717 in words is "two hundred fifty-five billion, six hundred sixty-six million, nine thousand, seven hundred seventeen".