1666850926877 has 2 divisors, whose sum is σ = 1666850926878. Its totient is φ = 1666850926876.

The previous prime is 1666850926817. The next prime is 1666850926879. The reversal of 1666850926877 is 7786290586661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1631906606521 + 34944320356 = 1277461^2 + 186934^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666850926877 - 2¹⁴ = 1666850910493 is a prime.

Together with 1666850926879, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666850926877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666850926879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833425463438 + 833425463439.

It is an arithmetic number, because the mean of its divisors is an integer number (833425463439).

Almost surely, 2^{1666850926877} is an apocalyptic number.

It is an amenable number.

1666850926877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666850926877 is an equidigital number, since it uses as much as digits as its factorization.

1666850926877 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1666850926877 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty million, nine hundred twenty-six thousand, eight hundred seventy-seven".