663238945 has 8 divisors (see below), whose sum is σ = 806789736. Its totient is φ = 523322496.

The previous prime is 663238931. The next prime is 663238951. The reversal of 663238945 is 549832366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 245486224 + 417752721 = 15668^2 + 20439^2 .

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 663238945 - 2⁵ = 663238913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663238895 and 663238904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908182 + ... + 908911.

It is an arithmetic number, because the mean of its divisors is an integer number (100848717).

Almost surely, 2^663238945 is an apocalyptic number.

It is an amenable number.

663238945 is a deficient number, since it is larger than the sum of its proper divisors (143550791).

663238945 is a wasteful number, since it uses less digits than its factorization.

663238945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817171.

The product of its digits is 933120, while the sum is 46.

The square root of 663238945 is about 25753.4258886075. The cubic root of 663238945 is about 872.0806960538.

The spelling of 663238945 in words is "six hundred sixty-three million, two hundred thirty-eight thousand, nine hundred forty-five".