1819850109893 has 2 divisors, whose sum is σ = 1819850109894. Its totient is φ = 1819850109892.

The previous prime is 1819850109859. The next prime is 1819850109941. The reversal of 1819850109893 is 3989010589181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1552471144324 + 267378965569 = 1245982^2 + 517087^2 .

It is a cyclic number.

It is not a de Polignac number, because 1819850109893 - 2²⁸ = 1819581674437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1819850109853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909925054946 + 909925054947.

It is an arithmetic number, because the mean of its divisors is an integer number (909925054947).

Almost surely, 2^{1819850109893} is an apocalyptic number.

It is an amenable number.

1819850109893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1819850109893 is an equidigital number, since it uses as much as digits as its factorization.

1819850109893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 62.

The spelling of 1819850109893 in words is "one trillion, eight hundred nineteen billion, eight hundred fifty million, one hundred nine thousand, eight hundred ninety-three".