866786253616525 has 96 divisors (see below), whose sum is σ = 1261935544991616. Its totient is φ = 583542266880000.

The previous prime is 866786253616523. The next prime is 866786253616529. The reversal of 866786253616525 is 525616352687668.

It is not a de Polignac number, because 866786253616525 - 2¹ = 866786253616523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786253616523) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4554434769 + ... + 4554625081.

It is an arithmetic number, because the mean of its divisors is an integer number (13145161926996).

Almost surely, 2^{866786253616525} is an apocalyptic number.

866786253616525 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

866786253616525 is a deficient number, since it is larger than the sum of its proper divisors (395149291375091).

866786253616525 is a wasteful number, since it uses less digits than its factorization.

866786253616525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206383 (or 206378 counting only the distinct ones).

The product of its digits is 5225472000, while the sum is 76.

The spelling of 866786253616525 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred fifty-three million, six hundred sixteen thousand, five hundred twenty-five".