663520847 has 4 divisors (see below), whose sum is σ = 723840936. Its totient is φ = 603200760.

The previous prime is 663520777. The next prime is 663520849. The reversal of 663520847 is 748025366.

It is a happy number.

663520847 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 663520847 - 2¹⁰ = 663519823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663520849) 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, 30160028 + ... + 30160049.

It is an arithmetic number, because the mean of its divisors is an integer number (180960234).

Almost surely, 2^663520847 is an apocalyptic number.

663520847 is a deficient number, since it is larger than the sum of its proper divisors (60320089).

663520847 is a wasteful number, since it uses less digits than its factorization.

663520847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60320088.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 663520847 is about 25758.8984042408. The cubic root of 663520847 is about 872.2042344717.

The spelling of 663520847 in words is "six hundred sixty-three million, five hundred twenty thousand, eight hundred forty-seven".