666363121011 has 64 divisors (see below), whose sum is σ = 1131185756160. Its totient is φ = 379784039040.

The previous prime is 666363121001. The next prime is 666363121057. The reversal of 666363121011 is 110121363666.

It is not a de Polignac number, because 666363121011 - 2⁵ = 666363120979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666363121001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 147521125 + ... + 147525641.

It is an arithmetic number, because the mean of its divisors is an integer number (17674777440).

Almost surely, 2^666363121011 is an apocalyptic number.

666363121011 is a deficient number, since it is larger than the sum of its proper divisors (464822635149).

666363121011 is a wasteful number, since it uses less digits than its factorization.

666363121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6401 (or 6395 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

Adding to 666363121011 its reverse (110121363666), we get a palindrome (776484484677).

The spelling of 666363121011 in words is "six hundred sixty-six billion, three hundred sixty-three million, one hundred twenty-one thousand, eleven".