668708354 has 8 divisors (see below), whose sum is σ = 1003229388. Its totient is φ = 334298560.

The previous prime is 668708309. The next prime is 668708357. The reversal of 668708354 is 453807866.

It can be written as a sum of positive squares in 2 ways, for example, as 667447225 + 1261129 = 25835^2 + 1123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 668708299 and 668708308.

It is not an unprimeable number, because it can be changed into a prime (668708357) 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, 10667 + ... + 38094.

Almost surely, 2^668708354 is an apocalyptic number.

668708354 is a deficient number, since it is larger than the sum of its proper divisors (334521034).

668708354 is a wasteful number, since it uses less digits than its factorization.

668708354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55620.

The product of its (nonzero) digits is 967680, while the sum is 47.

The square root of 668708354 is about 25859.3958552786. The cubic root of 668708354 is about 874.4713449896.

The spelling of 668708354 in words is "six hundred sixty-eight million, seven hundred eight thousand, three hundred fifty-four".