1666016414431 has 2 divisors, whose sum is σ = 1666016414432. Its totient is φ = 1666016414430.

The previous prime is 1666016414429. The next prime is 1666016414459. The reversal of 1666016414431 is 1344146106661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666016414431 - 2¹ = 1666016414429 is a prime.

It is a super-2 number, since 2×1666016414431² (a number of 25 digits) contains 22 as substring.

Together with 1666016414429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666016414471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833008207215 + 833008207216.

It is an arithmetic number, because the mean of its divisors is an integer number (833008207216).

Almost surely, 2^{1666016414431} is an apocalyptic number.

1666016414431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666016414431 is an equidigital number, since it uses as much as digits as its factorization.

1666016414431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 1666016414431 in words is "one trillion, six hundred sixty-six billion, sixteen million, four hundred fourteen thousand, four hundred thirty-one".