1813770990985 has 4 divisors (see below), whose sum is σ = 2176525189188. Its totient is φ = 1451016792784.

The previous prime is 1813770990943. The next prime is 1813770991001. The reversal of 1813770990985 is 5890990773181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 750875973961 + 1062895017024 = 866531^2 + 1030968^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813770990985 - 2¹⁷ = 1813770859913 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1813770990985.

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, 181377099094 + ... + 181377099103.

It is an arithmetic number, because the mean of its divisors is an integer number (544131297297).

Almost surely, 2^{1813770990985} is an apocalyptic number.

It is an amenable number.

1813770990985 is a deficient number, since it is larger than the sum of its proper divisors (362754198203).

1813770990985 is an equidigital number, since it uses as much as digits as its factorization.

1813770990985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362754198202.

The product of its (nonzero) digits is 34292160, while the sum is 67.

The spelling of 1813770990985 in words is "one trillion, eight hundred thirteen billion, seven hundred seventy million, nine hundred ninety thousand, nine hundred eighty-five".