666066668431 has 2 divisors, whose sum is σ = 666066668432. Its totient is φ = 666066668430.

The previous prime is 666066668419. The next prime is 666066668461. The reversal of 666066668431 is 134866660666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666066668431 - 2²¹ = 666064571279 is a prime.

It is a super-2 number, since 2×666066668431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666066668411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333033334215 + 333033334216.

It is an arithmetic number, because the mean of its divisors is an integer number (333033334216).

Almost surely, 2^666066668431 is an apocalyptic number.

666066668431 is a deficient number, since it is larger than the sum of its proper divisors (1).

666066668431 is an equidigital number, since it uses as much as digits as its factorization.

666066668431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26873856, while the sum is 58.

The spelling of 666066668431 in words is "six hundred sixty-six billion, sixty-six million, six hundred sixty-eight thousand, four hundred thirty-one".