666121637535331 has 2 divisors, whose sum is σ = 666121637535332. Its totient is φ = 666121637535330.

The previous prime is 666121637535311. The next prime is 666121637535349. The reversal of 666121637535331 is 133535736121666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666121637535331 - 2³¹ = 666119490051683 is a prime.

It is a super-2 number, since 2×666121637535331² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666121637535311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333060818767665 + 333060818767666.

It is an arithmetic number, because the mean of its divisors is an integer number (333060818767666).

Almost surely, 2^{666121637535331} is an apocalyptic number.

666121637535331 is a deficient number, since it is larger than the sum of its proper divisors (1).

666121637535331 is an equidigital number, since it uses as much as digits as its factorization.

666121637535331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36741600, while the sum is 58.

The spelling of 666121637535331 in words is "six hundred sixty-six trillion, one hundred twenty-one billion, six hundred thirty-seven million, five hundred thirty-five thousand, three hundred thirty-one".