663522644 has 12 divisors (see below), whose sum is σ = 1162230804. Its totient is φ = 331456704.

The previous prime is 663522611. The next prime is 663522677. The reversal of 663522644 is 446225366.

It is an interprime number because it is at equal distance from previous prime (663522611) and next prime (663522677).

It can be written as a sum of positive squares in 2 ways, for example, as 450712900 + 212809744 = 21230^2 + 14588^2 .

It is a junction number, because it is equal to n+sod(n) for n = 663522598 and 663522607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71219 + ... + 79994.

It is an arithmetic number, because the mean of its divisors is an integer number (96852567).

Almost surely, 2^663522644 is an apocalyptic number.

It is an amenable number.

663522644 is a deficient number, since it is larger than the sum of its proper divisors (498708160).

663522644 is a wasteful number, since it uses less digits than its factorization.

663522644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152314 (or 152312 counting only the distinct ones).

The product of its digits is 207360, while the sum is 38.

The square root of 663522644 is about 25758.9332853672. The cubic root of 663522644 is about 872.2050218620.

The spelling of 663522644 in words is "six hundred sixty-three million, five hundred twenty-two thousand, six hundred forty-four".