1866081687047 has 2 divisors, whose sum is σ = 1866081687048. Its totient is φ = 1866081687046.

The previous prime is 1866081686969. The next prime is 1866081687053. The reversal of 1866081687047 is 7407861806681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1866081687047 - 2²⁸ = 1865813251591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1866081689047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933040843523 + 933040843524.

It is an arithmetic number, because the mean of its divisors is an integer number (933040843524).

Almost surely, 2^{1866081687047} is an apocalyptic number.

1866081687047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866081687047 is an equidigital number, since it uses as much as digits as its factorization.

1866081687047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21676032, while the sum is 62.

The spelling of 1866081687047 in words is "one trillion, eight hundred sixty-six billion, eighty-one million, six hundred eighty-seven thousand, forty-seven".