1803694662289 has 81 divisors (see below), whose sum is σ = 2131211234673. Its totient is φ = 1525495405824.

The previous prime is 1803694662257. The next prime is 1803694662313. The reversal of 1803694662289 is 9822664963081.

The square root of 1803694662289 is 1343017.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 16286098689 + 1787408563600 = 127617^2 + 1336940^2 .

It is not a de Polignac number, because 1803694662289 - 2⁵ = 1803694662257 is a prime.

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 1803694662289.

It is not an unprimeable number, because it can be changed into a prime (1803694662229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 17511598612 + ... + 17511598714.

Almost surely, 2^{1803694662289} is an apocalyptic number.

1803694662289 is the 1343017-th square number.

1803694662289 is the 671509-th centered octagonal number.

It is an amenable number.

1803694662289 is a deficient number, since it is larger than the sum of its proper divisors (327516572384).

1803694662289 is an equidigital number, since it uses as much as digits as its factorization.

1803694662289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 64.

Multiplying 1803694662289 by its sum of digits (64), we get a square (115436458386496 = 10744136²).

The spelling of 1803694662289 in words is "one trillion, eight hundred three billion, six hundred ninety-four million, six hundred sixty-two thousand, two hundred eighty-nine".