1866081687053 has 2 divisors, whose sum is σ = 1866081687054. Its totient is φ = 1866081687052.

The previous prime is 1866081687047. The next prime is 1866081687083. The reversal of 1866081687053 is 3507861806681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1772101427209 + 93980259844 = 1331203^2 + 306562^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866081687053 - 2⁸ = 1866081686797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1866081686983 and 1866081687001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1866081687083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933040843526 + 933040843527.

It is an arithmetic number, because the mean of its divisors is an integer number (933040843527).

Almost surely, 2^{1866081687053} is an apocalyptic number.

It is an amenable number.

1866081687053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866081687053 is an equidigital number, since it uses as much as digits as its factorization.

1866081687053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 1866081687053 in words is "one trillion, eight hundred sixty-six billion, eighty-one million, six hundred eighty-seven thousand, fifty-three".