663081540 has 48 divisors (see below), whose sum is σ = 2025414720. Its totient is φ = 160746880.

The previous prime is 663081473. The next prime is 663081541. The reversal of 663081540 is 45180366.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (663081541) 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 15 ways as a sum of consecutive naturals, for example, 501675 + ... + 502994.

It is an arithmetic number, because the mean of its divisors is an integer number (42196140).

Almost surely, 2^663081540 is an apocalyptic number.

663081540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663081540 is an abundant number, since it is smaller than the sum of its proper divisors (1362333180).

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

663081540 is a wasteful number, since it uses less digits than its factorization.

663081540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004692 (or 1004690 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 663081540 is about 25750.3697060838. The cubic root of 663081540 is about 872.0117009484.

The spelling of 663081540 in words is "six hundred sixty-three million, eighty-one thousand, five hundred forty".