1866974928391 has 2 divisors, whose sum is σ = 1866974928392. Its totient is φ = 1866974928390.

The previous prime is 1866974928347. The next prime is 1866974928397. The reversal of 1866974928391 is 1938294796681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1866974928391 - 2⁹ = 1866974927879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1866974928397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933487464195 + 933487464196.

It is an arithmetic number, because the mean of its divisors is an integer number (933487464196).

Almost surely, 2^{1866974928391} is an apocalyptic number.

1866974928391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866974928391 is an equidigital number, since it uses as much as digits as its factorization.

1866974928391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282175488, while the sum is 73.

The spelling of 1866974928391 in words is "one trillion, eight hundred sixty-six billion, nine hundred seventy-four million, nine hundred twenty-eight thousand, three hundred ninety-one".