663499540 has 72 divisors (see below), whose sum is σ = 1562918112. Its totient is φ = 234645120.

The previous prime is 663499537. The next prime is 663499547. The reversal of 663499540 is 45994366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663499547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 300079 + ... + 302281.

It is an arithmetic number, because the mean of its divisors is an integer number (21707196).

Almost surely, 2^663499540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663499540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781459056).

663499540 is an abundant number, since it is smaller than the sum of its proper divisors (899418572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663499540 is a wasteful number, since it uses less digits than its factorization.

663499540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297 (or 2258 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 663499540 is about 25758.4848156874. The cubic root of 663499540 is about 872.1948982895.

The spelling of 663499540 in words is "six hundred sixty-three million, four hundred ninety-nine thousand, five hundred forty".