663501540 has 96 divisors (see below), whose sum is σ = 2006839296. Its totient is φ = 162823680.

The previous prime is 663501533. The next prime is 663501569. The reversal of 663501540 is 45105366.

663501540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 663501498 and 663501507.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297630 + ... + 299850.

It is an arithmetic number, because the mean of its divisors is an integer number (20904576).

Almost surely, 2^663501540 is an apocalyptic number.

663501540 is a gapful number since it is divisible by the number (60) 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 663501540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003419648).

663501540 is an abundant number, since it is smaller than the sum of its proper divisors (1343337756).

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

663501540 is a wasteful number, since it uses less digits than its factorization.

663501540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629 (or 2627 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 663501540 is about 25758.5236378174. The cubic root of 663501540 is about 872.1957746468.

The spelling of 663501540 in words is "six hundred sixty-three million, five hundred one thousand, five hundred forty".