663400650 has 72 divisors (see below), whose sum is σ = 1808446752. Its totient is φ = 160820000.

The previous prime is 663400613. The next prime is 663400679. The reversal of 663400650 is 56004366.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 126 + ... + 36425.

It is an arithmetic number, because the mean of its divisors is an integer number (25117316).

Almost surely, 2^663400650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663400650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904223376).

663400650 is an abundant number, since it is smaller than the sum of its proper divisors (1145046102).

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

663400650 is a wasteful number, since it uses less digits than its factorization.

663400650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36588 (or 36572 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 663400650 is about 25756.5651824928. The cubic root of 663400650 is about 872.1515646052.

The spelling of 663400650 in words is "six hundred sixty-three million, four hundred thousand, six hundred fifty".