1868191646873 has 2 divisors, whose sum is σ = 1868191646874. Its totient is φ = 1868191646872.

The previous prime is 1868191646771. The next prime is 1868191646887. The reversal of 1868191646873 is 3786461918681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1245170320384 + 623021326489 = 1115872^2 + 789317^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868191646873 - 2²⁶ = 1868124538009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1868191616873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934095823436 + 934095823437.

It is an arithmetic number, because the mean of its divisors is an integer number (934095823437).

Almost surely, 2^{1868191646873} is an apocalyptic number.

It is an amenable number.

1868191646873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868191646873 is an equidigital number, since it uses as much as digits as its factorization.

1868191646873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 83607552, while the sum is 68.

The spelling of 1868191646873 in words is "one trillion, eight hundred sixty-eight billion, one hundred ninety-one million, six hundred forty-six thousand, eight hundred seventy-three".