1666850926787 has 2 divisors, whose sum is σ = 1666850926788. Its totient is φ = 1666850926786.

The previous prime is 1666850926771. The next prime is 1666850926817. The reversal of 1666850926787 is 7876290586661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666850926787 - 2⁴ = 1666850926771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666850926787.

It is not a weakly prime, because it can be changed into another prime (1666850526787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833425463393 + 833425463394.

It is an arithmetic number, because the mean of its divisors is an integer number (833425463394).

Almost surely, 2^{1666850926787} is an apocalyptic number.

1666850926787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666850926787 is an equidigital number, since it uses as much as digits as its factorization.

1666850926787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 365783040, while the sum is 71.

The spelling of 1666850926787 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty million, nine hundred twenty-six thousand, seven hundred eighty-seven".