663206540 has 24 divisors (see below), whose sum is σ = 1398720960. Its totient is φ = 264142208.

The previous prime is 663206521. The next prime is 663206561. The reversal of 663206540 is 45602366.

It is a junction number, because it is equal to n+sod(n) for n = 663206497 and 663206506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66500 + ... + 75819.

It is an arithmetic number, because the mean of its divisors is an integer number (58280040).

Almost surely, 2^663206540 is an apocalyptic number.

It is an amenable number.

663206540 is an abundant number, since it is smaller than the sum of its proper divisors (735514420).

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

663206540 is a wasteful number, since it uses less digits than its factorization.

663206540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142561 (or 142559 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 663206540 is about 25752.7967413250. The cubic root of 663206540 is about 872.0664929095.

The spelling of 663206540 in words is "six hundred sixty-three million, two hundred six thousand, five hundred forty".