666666686666622 has 32 divisors (see below), whose sum is σ = 1355248716521760. Its totient is φ = 218569980395520.

The previous prime is 666666686666621. The next prime is 666666686666699. The reversal of 666666686666622 is 226666686666666.

It is a super-2 number, since 2×666666686666622² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666686666621) 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 15 ways as a sum of consecutive naturals, for example, 29935363 + ... + 47217150.

It is an arithmetic number, because the mean of its divisors is an integer number (42351522391305).

Almost surely, 2^{666666686666622} is an apocalyptic number.

666666686666622 is an abundant number, since it is smaller than the sum of its proper divisors (688582029855138).

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

666666686666622 is a wasteful number, since it uses less digits than its factorization.

666666686666622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77176188.

The product of its digits is 69657034752, while the sum is 84.

The spelling of 666666686666622 in words is "six hundred sixty-six trillion, six hundred sixty-six billion, six hundred eighty-six million, six hundred sixty-six thousand, six hundred twenty-two".