663240481 has 4 divisors (see below), whose sum is σ = 663569712. Its totient is φ = 662911252.

The previous prime is 663240439. The next prime is 663240511. The reversal of 663240481 is 184042366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663240481 - 2¹⁷ = 663109409 is a prime.

It is a super-2 number, since 2×663240481² = 879775871274222722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663240421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161575 + ... + 165628.

It is an arithmetic number, because the mean of its divisors is an integer number (165892428).

Almost surely, 2^663240481 is an apocalyptic number.

It is an amenable number.

663240481 is a deficient number, since it is larger than the sum of its proper divisors (329231).

663240481 is a wasteful number, since it uses less digits than its factorization.

663240481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329230.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 663240481 is about 25753.4557098654. The cubic root of 663240481 is about 872.0813692726.

The spelling of 663240481 in words is "six hundred sixty-three million, two hundred forty thousand, four hundred eighty-one".