663004813 has 8 divisors (see below), whose sum is σ = 681979160. Its totient is φ = 644086080.

The previous prime is 663004801. The next prime is 663004861. The reversal of 663004813 is 318400366.

It can be written as a sum of positive squares in 4 ways, for example, as 259918884 + 403085929 = 16122^2 + 20077^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663004813 is a prime.

It is a super-2 number, since 2×663004813² = 879150764122329938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663004883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10903 + ... + 38011.

It is an arithmetic number, because the mean of its divisors is an integer number (85247395).

Almost surely, 2^663004813 is an apocalyptic number.

It is an amenable number.

663004813 is a deficient number, since it is larger than the sum of its proper divisors (18974347).

663004813 is a wasteful number, since it uses less digits than its factorization.

663004813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27807.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 663004813 is about 25748.8798397134. The cubic root of 663004813 is about 871.9780653553.

The spelling of 663004813 in words is "six hundred sixty-three million, four thousand, eight hundred thirteen".