866786517378846 has 24 divisors (see below), whose sum is σ = 1884076159973904. Its totient is φ = 287999807487360.

The previous prime is 866786517378839. The next prime is 866786517378913. The reversal of 866786517378846 is 648873715687668.

866786517378846 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 6 + 517 + 3 + 7 + 8 + 84 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77419297491 + ... + 77419308686.

It is an arithmetic number, because the mean of its divisors is an integer number (78503173332246).

Almost surely, 2^{866786517378846} is an apocalyptic number.

866786517378846 is an abundant number, since it is smaller than the sum of its proper divisors (1017289642595058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866786517378846 is a wasteful number, since it uses less digits than its factorization.

866786517378846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154838606496 (or 154838606493 counting only the distinct ones).

The product of its digits is 109247201280, while the sum is 90.

The spelling of 866786517378846 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred seventeen million, three hundred seventy-eight thousand, eight hundred forty-six".