866682660426 has 64 divisors (see below), whose sum is σ = 1928125734912. Its totient is φ = 257494680000.

The previous prime is 866682660421. The next prime is 866682660433. The reversal of 866682660426 is 624066286668.

It is a happy number.

It is a super-2 number, since 2×866682660426² (a number of 25 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 866682660426.

It is not an unprimeable number, because it can be changed into a prime (866682660421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 905991 + ... + 1598181.

It is an arithmetic number, because the mean of its divisors is an integer number (30126964608).

Almost surely, 2^866682660426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866682660426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964062867456).

866682660426 is an abundant number, since it is smaller than the sum of its proper divisors (1061443074486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866682660426 is a wasteful number, since it uses less digits than its factorization.

866682660426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692579.

The product of its (nonzero) digits is 47775744, while the sum is 60.

The spelling of 866682660426 in words is "eight hundred sixty-six billion, six hundred eighty-two million, six hundred sixty thousand, four hundred twenty-six".