666731401228 has 12 divisors (see below), whose sum is σ = 1166950906632. Its totient is φ = 333316856480.

The previous prime is 666731401177. The next prime is 666731401229. The reversal of 666731401228 is 822104137666.

It is a super-2 number, since 2×666731401228² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666731401229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12180313 + ... + 12234928.

It is an arithmetic number, because the mean of its divisors is an integer number (97245908886).

Almost surely, 2^666731401228 is an apocalyptic number.

It is an amenable number.

666731401228 is a deficient number, since it is larger than the sum of its proper divisors (500219505404).

666731401228 is a wasteful number, since it uses less digits than its factorization.

666731401228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24422072 (or 24422070 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 666731401228 in words is "six hundred sixty-six billion, seven hundred thirty-one million, four hundred one thousand, two hundred twenty-eight".