1666868370031 has 2 divisors, whose sum is σ = 1666868370032. Its totient is φ = 1666868370030.

The previous prime is 1666868370017. The next prime is 1666868370049. The reversal of 1666868370031 is 1300738686661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666868370031 - 2²¹ = 1666866272879 is a prime.

It is a super-2 number, since 2×1666868370031² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666868370001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833434185015 + 833434185016.

It is an arithmetic number, because the mean of its divisors is an integer number (833434185016).

Almost surely, 2^{1666868370031} is an apocalyptic number.

1666868370031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666868370031 is an equidigital number, since it uses as much as digits as its factorization.

1666868370031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 1666868370031 in words is "one trillion, six hundred sixty-six billion, eight hundred sixty-eight million, three hundred seventy thousand, thirty-one".