663649536 has 144 divisors (see below), whose sum is σ = 2040631488. Its totient is φ = 189235200.

The previous prime is 663649513. The next prime is 663649627. The reversal of 663649536 is 635946366.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent 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, 141306 + ... + 145926.

It is an arithmetic number, because the mean of its divisors is an integer number (14171052).

Almost surely, 2^663649536 is an apocalyptic number.

663649536 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663649536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020315744).

663649536 is an abundant number, since it is smaller than the sum of its proper divisors (1376981952).

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

663649536 is a wasteful number, since it uses less digits than its factorization.

663649536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668 (or 4654 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 48.

The square root of 663649536 is about 25761.3962354528. The cubic root of 663649536 is about 872.2606184500.

The spelling of 663649536 in words is "six hundred sixty-three million, six hundred forty-nine thousand, five hundred thirty-six".