866786517536454 has 40 divisors (see below), whose sum is σ = 1953874066204368. Its totient is φ = 287198726360400.

The previous prime is 866786517536393. The next prime is 866786517536473. The reversal of 866786517536454 is 454635715687668.

It is a happy number.

866786517536454 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 6 + 517 + 53 + 6 + 45 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16019535997 + ... + 16019590104.

Almost surely, 2^{866786517536454} is an apocalyptic number.

866786517536454 is an abundant number, since it is smaller than the sum of its proper divisors (1087087548667914).

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

866786517536454 is a wasteful number, since it uses less digits than its factorization.

866786517536454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32039126282 (or 32039126273 counting only the distinct ones).

The product of its digits is 24385536000, while the sum is 81.

The spelling of 866786517536454 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred seventeen million, five hundred thirty-six thousand, four hundred fifty-four".