663213770 has 32 divisors (see below), whose sum is σ = 1210453200. Its totient is φ = 261605376.

The previous prime is 663213743. The next prime is 663213779. The reversal of 663213770 is 77312366.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 553990369 + 109223401 = 23537^2 + 10451^2 .

It is a super-2 number, since 2×663213770² = 879705009435225800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 663213770.

It is not an unprimeable number, because it can be changed into a prime (663213779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248282 + ... + 250938.

Almost surely, 2^663213770 is an apocalyptic number.

663213770 is a deficient number, since it is larger than the sum of its proper divisors (547239430).

663213770 is a wasteful number, since it uses less digits than its factorization.

663213770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 663213770 is about 25752.9371140458. The cubic root of 663213770 is about 872.0696618659.

It can be divided in two parts, 6632 and 13770, that added together give a palindrome (20402).

The spelling of 663213770 in words is "six hundred sixty-three million, two hundred thirteen thousand, seven hundred seventy".