1819861878713 has 2 divisors, whose sum is σ = 1819861878714. Its totient is φ = 1819861878712.

The previous prime is 1819861878643. The next prime is 1819861878763. The reversal of 1819861878713 is 3178781689181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1336040080384 + 483821798329 = 1155872^2 + 695573^2 .

It is a cyclic number.

It is not a de Polignac number, because 1819861878713 - 2¹⁶ = 1819861813177 is a prime.

It is not a weakly prime, because it can be changed into another prime (1819861878763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909930939356 + 909930939357.

It is an arithmetic number, because the mean of its divisors is an integer number (909930939357).

Almost surely, 2^{1819861878713} is an apocalyptic number.

It is an amenable number.

1819861878713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1819861878713 is an equidigital number, since it uses as much as digits as its factorization.

1819861878713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32514048, while the sum is 68.

The spelling of 1819861878713 in words is "one trillion, eight hundred nineteen billion, eight hundred sixty-one million, eight hundred seventy-eight thousand, seven hundred thirteen".