866786026508687 has 16 divisors (see below), whose sum is σ = 881968111200000. Its totient is φ = 851620419577344.

The previous prime is 866786026508657. The next prime is 866786026508713. The reversal of 866786026508687 is 786805620687668.

It is a happy number.

It is not a de Polignac number, because 866786026508687 - 2¹⁶ = 866786026443151 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 (866786026508657) 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, 859238063 + ... + 860246255.

It is an arithmetic number, because the mean of its divisors is an integer number (55123006950000).

Almost surely, 2^{866786026508687} is an apocalyptic number.

866786026508687 is a deficient number, since it is larger than the sum of its proper divisors (15182084691313).

866786026508687 is a wasteful number, since it uses less digits than its factorization.

866786026508687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016350.

The product of its (nonzero) digits is 15606743040, while the sum is 83.

The spelling of 866786026508687 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, twenty-six million, five hundred eight thousand, six hundred eighty-seven".