1780203219345 has 24 divisors (see below), whose sum is σ = 3086864877096. Its totient is φ = 949078856448.

The previous prime is 1780203219329. The next prime is 1780203219433. The reversal of 1780203219345 is 5439123020871.

It is a happy number.

1780203219345 is a `hidden beast` number, since 1 + 7 + 80 + 203 + 21 + 9 + 345 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 861894994689 + 918308224656 = 928383^2 + 958284^2 .

It is not a de Polignac number, because 1780203219345 - 2⁴ = 1780203219329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1780203219345.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7440522 + ... + 7676051.

It is an arithmetic number, because the mean of its divisors is an integer number (128619369879).

Almost surely, 2^{1780203219345} is an apocalyptic number.

1780203219345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1780203219345 is a deficient number, since it is larger than the sum of its proper divisors (1306661657751).

1780203219345 is a wasteful number, since it uses less digits than its factorization.

1780203219345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15119201 (or 15119198 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 1780203219345 in words is "one trillion, seven hundred eighty billion, two hundred three million, two hundred nineteen thousand, three hundred forty-five".