663521226 has 16 divisors (see below), whose sum is σ = 1336591200. Its totient is φ = 219582288.

The previous prime is 663521219. The next prime is 663521233. The reversal of 663521226 is 622125366.

663521226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (663521219) and next prime (663521233).

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, 396961 + ... + 398628.

It is an arithmetic number, because the mean of its divisors is an integer number (83536950).

Almost surely, 2^663521226 is an apocalyptic number.

663521226 is an abundant number, since it is smaller than the sum of its proper divisors (673069974).

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

663521226 is a wasteful number, since it uses less digits than its factorization.

663521226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795733.

The product of its digits is 25920, while the sum is 33.

The square root of 663521226 is about 25758.9057609208. The cubic root of 663521226 is about 872.2044005380.

The spelling of 663521226 in words is "six hundred sixty-three million, five hundred twenty-one thousand, two hundred twenty-six".