1819850109866 has 8 divisors (see below), whose sum is σ = 2729781298404. Its totient is φ = 909923010400.

The previous prime is 1819850109859. The next prime is 1819850109893. The reversal of 1819850109866 is 6689010589181.

It can be written as a sum of positive squares in 2 ways, for example, as 1724139694225 + 95710415641 = 1313065^2 + 309371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1819850109799 and 1819850109808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614486 + ... + 2004318.

Almost surely, 2^{1819850109866} is an apocalyptic number.

1819850109866 is a deficient number, since it is larger than the sum of its proper divisors (909931188538).

1819850109866 is a wasteful number, since it uses less digits than its factorization.

1819850109866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044536.

The product of its (nonzero) digits is 7464960, while the sum is 62.

The spelling of 1819850109866 in words is "one trillion, eight hundred nineteen billion, eight hundred fifty million, one hundred nine thousand, eight hundred sixty-six".