1816540045 has 32 divisors (see below), whose sum is σ = 2262221280. Its totient is φ = 1399680000.

The previous prime is 1816540043. The next prime is 1816540051. The reversal of 1816540045 is 5400456181.

It can be written as a sum of positive squares in 16 ways, for example, as 306285001 + 1510255044 = 17501^2 + 38862^2 .

It is not a de Polignac number, because 1816540045 - 2¹ = 1816540043 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816540043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3357475 + ... + 3358015.

It is an arithmetic number, because the mean of its divisors is an integer number (70694415).

Almost surely, 2^1816540045 is an apocalyptic number.

It is an amenable number.

1816540045 is a deficient number, since it is larger than the sum of its proper divisors (445681235).

1816540045 is a wasteful number, since it uses less digits than its factorization.

1816540045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 1816540045 is about 42620.8874262374. The cubic root of 1816540045 is about 1220.1549666538.

The spelling of 1816540045 in words is "one billion, eight hundred sixteen million, five hundred forty thousand, forty-five".