1663515345 has 16 divisors (see below), whose sum is σ = 2726543232. Its totient is φ = 865568640.

The previous prime is 1663515307. The next prime is 1663515361. The reversal of 1663515345 is 5435153661.

1663515345 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1663515345 - 2⁹ = 1663514833 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1351837 + ... + 1353066.

It is an arithmetic number, because the mean of its divisors is an integer number (170408952).

Almost surely, 2^1663515345 is an apocalyptic number.

1663515345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1663515345 is a deficient number, since it is larger than the sum of its proper divisors (1063027887).

1663515345 is a wasteful number, since it uses less digits than its factorization.

1663515345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704952.

The product of its digits is 162000, while the sum is 39.

The square root of 1663515345 is about 40786.2151345280. The cubic root of 1663515345 is about 1184.8833690336.

The spelling of 1663515345 in words is "one billion, six hundred sixty-three million, five hundred fifteen thousand, three hundred forty-five".