866786517366746 has 4 divisors (see below), whose sum is σ = 1300179776050122. Its totient is φ = 433393258683372.

The previous prime is 866786517366733. The next prime is 866786517366773. The reversal of 866786517366746 is 647663715687668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 857563725387721 + 9222791979025 = 29284189^2 + 3036905^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216696629341685 + ... + 216696629341688.

Almost surely, 2^{866786517366746} is an apocalyptic number.

866786517366746 is a deficient number, since it is larger than the sum of its proper divisors (433393258683376).

866786517366746 is a wasteful number, since it uses less digits than its factorization.

866786517366746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433393258683375.

The product of its digits is 61451550720, while the sum is 86.

The spelling of 866786517366746 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred seventeen million, three hundred sixty-six thousand, seven hundred forty-six".