663831947 has 8 divisors (see below), whose sum is σ = 670338240. Its totient is φ = 657336960.

The previous prime is 663831941. The next prime is 663831977. The reversal of 663831947 is 749138366.

It is a happy number.

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 663831947 - 2¹⁴ = 663815563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663831941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159422 + ... + 163532.

It is an arithmetic number, because the mean of its divisors is an integer number (83792280).

Almost surely, 2^663831947 is an apocalyptic number.

663831947 is a deficient number, since it is larger than the sum of its proper divisors (6506293).

663831947 is a wasteful number, since it uses less digits than its factorization.

663831947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653.

The product of its digits is 653184, while the sum is 47.

The square root of 663831947 is about 25764.9363864924. The cubic root of 663831947 is about 872.3405277734.

It can be divided in two parts, 6638319 and 47, that added together give a palindrome (6638366).

The spelling of 663831947 in words is "six hundred sixty-three million, eight hundred thirty-one thousand, nine hundred forty-seven".