866763363803777 has 4 divisors (see below), whose sum is σ = 945560033240496. Its totient is φ = 787966694367060.

The previous prime is 866763363803749. The next prime is 866763363803833. The reversal of 866763363803777 is 777308363367668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866763363803777 - 2¹² = 866763363799681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866763363803677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39398334718343 + ... + 39398334718364.

It is an arithmetic number, because the mean of its divisors is an integer number (236390008310124).

Almost surely, 2^{866763363803777} is an apocalyptic number.

It is an amenable number.

866763363803777 is a deficient number, since it is larger than the sum of its proper divisors (78796669436719).

866763363803777 is a wasteful number, since it uses less digits than its factorization.

866763363803777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78796669436718.

The product of its (nonzero) digits is 16131032064, while the sum is 80.

The spelling of 866763363803777 in words is "eight hundred sixty-six trillion, seven hundred sixty-three billion, three hundred sixty-three million, eight hundred three thousand, seven hundred seventy-seven".