666363121012 has 6 divisors (see below), whose sum is σ = 1166135461778. Its totient is φ = 333181560504.

The previous prime is 666363121001. The next prime is 666363121057. The reversal of 666363121012 is 210121363666.

666363121012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 644446095076 + 21917025936 = 802774^2 + 148044^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83295390123 + ... + 83295390130.

Almost surely, 2^666363121012 is an apocalyptic number.

It is an amenable number.

666363121012 is a deficient number, since it is larger than the sum of its proper divisors (499772340766).

666363121012 is a wasteful number, since it uses less digits than its factorization.

666363121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166590780257 (or 166590780255 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

Adding to 666363121012 its reverse (210121363666), we get a palindrome (876484484678).

The spelling of 666363121012 in words is "six hundred sixty-six billion, three hundred sixty-three million, one hundred twenty-one thousand, twelve".