668319336 has 40 divisors (see below), whose sum is σ = 1871914770. Its totient is φ = 222772896.

The previous prime is 668319331. The next prime is 668319383. The reversal of 668319336 is 633913866.

It can be written as a sum of positive squares in only one way, i.e., 424772100 + 243547236 = 20610^2 + 15606^2 .

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 668319291 and 668319300.

It is not an unprimeable number, because it can be changed into a prime (668319331) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 515031 + ... + 516326.

Almost surely, 2^668319336 is an apocalyptic number.

It is an amenable number.

668319336 is an abundant number, since it is smaller than the sum of its proper divisors (1203595434).

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

668319336 is a wasteful number, since it uses less digits than its factorization.

668319336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031375 (or 1031362 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 668319336 is about 25851.8729688972. The cubic root of 668319336 is about 874.3017388725.

It can be divided in two parts, 66831 and 9336, that added together give a palindrome (76167).

The spelling of 668319336 in words is "six hundred sixty-eight million, three hundred nineteen thousand, three hundred thirty-six".