666822740688 has 80 divisors (see below), whose sum is σ = 2061261195840. Its totient is φ = 205176226176.

The previous prime is 666822740669. The next prime is 666822740693. The reversal of 666822740688 is 886047228666.

It is a happy number.

It is a super-3 number, since 3×666822740688³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59362506 + ... + 59373737.

It is an arithmetic number, because the mean of its divisors is an integer number (25765764948).

Almost surely, 2^666822740688 is an apocalyptic number.

It is an amenable number.

666822740688 is an abundant number, since it is smaller than the sum of its proper divisors (1394438455152).

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

666822740688 is a wasteful number, since it uses less digits than its factorization.

666822740688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118736273 (or 118736261 counting only the distinct ones).

The product of its (nonzero) digits is 74317824, while the sum is 63.

The spelling of 666822740688 in words is "six hundred sixty-six billion, eight hundred twenty-two million, seven hundred forty thousand, six hundred eighty-eight".