866788807366426 has 24 divisors (see below), whose sum is σ = 1513199785966560. Its totient is φ = 371298729560472.

The previous prime is 866788807366423. The next prime is 866788807366501. The reversal of 866788807366426 is 624663708887668.

It is a happy number.

It is a super-2 number, since 2×866788807366426² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866788807366423) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 2168702520 + ... + 2169102163.

It is an arithmetic number, because the mean of its divisors is an integer number (63049991081940).

Almost surely, 2^{866788807366426} is an apocalyptic number.

866788807366426 is a deficient number, since it is larger than the sum of its proper divisors (646410978600134).

866788807366426 is a wasteful number, since it uses less digits than its factorization.

866788807366426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4337806738 (or 4337806731 counting only the distinct ones).

The product of its (nonzero) digits is 37456183296, while the sum is 85.

The spelling of 866788807366426 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, eight hundred seven million, three hundred sixty-six thousand, four hundred twenty-six".