866205775410868 has 48 divisors (see below), whose sum is σ = 1546605015943680. Its totient is φ = 424409019450624.

The previous prime is 866205775410853. The next prime is 866205775410869. The reversal of 866205775410868 is 868014577502668.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 866205775410868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866205775410869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21891880 + ... + 47028352.

It is an arithmetic number, because the mean of its divisors is an integer number (32220937832160).

Almost surely, 2^{866205775410868} is an apocalyptic number.

It is an amenable number.

866205775410868 is a deficient number, since it is larger than the sum of its proper divisors (680399240532812).

866205775410868 is a wasteful number, since it uses less digits than its factorization.

866205775410868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25137376 (or 25137374 counting only the distinct ones).

The product of its (nonzero) digits is 1083801600, while the sum is 73.

The spelling of 866205775410868 in words is "eight hundred sixty-six trillion, two hundred five billion, seven hundred seventy-five million, four hundred ten thousand, eight hundred sixty-eight".