866786232786761 has 4 divisors (see below), whose sum is σ = 990612837470592. Its totient is φ = 742959628102932.

The previous prime is 866786232786701. The next prime is 866786232786779. The reversal of 866786232786761 is 167687232687668.

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 866786232786761 - 2¹⁸ = 866786232524617 is a prime.

It is a super-2 number, since 2×866786232786761² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866786232786761.

It is not an unprimeable number, because it can be changed into a prime (866786232786701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61913302341905 + ... + 61913302341918.

It is an arithmetic number, because the mean of its divisors is an integer number (247653209367648).

Almost surely, 2^{866786232786761} is an apocalyptic number.

It is an amenable number.

866786232786761 is a deficient number, since it is larger than the sum of its proper divisors (123826604683831).

866786232786761 is a wasteful number, since it uses less digits than its factorization.

866786232786761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123826604683830.

The product of its digits is 16387080192, while the sum is 83.

The spelling of 866786232786761 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred thirty-two million, seven hundred eighty-six thousand, seven hundred sixty-one".