1666267554319 has 2 divisors, whose sum is σ = 1666267554320. Its totient is φ = 1666267554318.

The previous prime is 1666267554307. The next prime is 1666267554323. The reversal of 1666267554319 is 9134557626661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666267554319 - 2¹⁹ = 1666267030031 is a prime.

It is a super-2 number, since 2×1666267554319² (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 (1666267554389) 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, 833133777159 + 833133777160.

It is an arithmetic number, because the mean of its divisors is an integer number (833133777160).

Almost surely, 2^{1666267554319} is an apocalyptic number.

1666267554319 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666267554319 is an equidigital number, since it uses as much as digits as its factorization.

1666267554319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48988800, while the sum is 61.

The spelling of 1666267554319 in words is "one trillion, six hundred sixty-six billion, two hundred sixty-seven million, five hundred fifty-four thousand, three hundred nineteen".