1663715345 has 8 divisors (see below), whose sum is σ = 1997220264. Its totient is φ = 1330464384.

The previous prime is 1663715311. The next prime is 1663715357. The reversal of 1663715345 is 5435173661.

It can be written as a sum of positive squares in 4 ways, for example, as 380689 + 1663334656 = 617^2 + 40784^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1663715345 - 2¹⁶ = 1663649809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48764 + ... + 75533.

It is an arithmetic number, because the mean of its divisors is an integer number (249652533).

Almost surely, 2^1663715345 is an apocalyptic number.

It is an amenable number.

1663715345 is a deficient number, since it is larger than the sum of its proper divisors (333504919).

1663715345 is a wasteful number, since it uses less digits than its factorization.

1663715345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126979.

The product of its digits is 226800, while the sum is 41.

The square root of 1663715345 is about 40788.6668696097. Note that the first 3 decimals coincide. The cubic root of 1663715345 is about 1184.9308522500.

The spelling of 1663715345 in words is "one billion, six hundred sixty-three million, seven hundred fifteen thousand, three hundred forty-five".