668353385 has 48 divisors (see below), whose sum is σ = 1014779664. Its totient is φ = 419586048.

The previous prime is 668353381. The next prime is 668353417. The reversal of 668353385 is 583353866.

It can be written as a sum of positive squares in 8 ways, for example, as 802816 + 667550569 = 896^2 + 25837^2 .

It is not a de Polignac number, because 668353385 - 2² = 668353381 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668353381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 151937 + ... + 156273.

It is an arithmetic number, because the mean of its divisors is an integer number (21141243).

Almost surely, 2^668353385 is an apocalyptic number.

It is an amenable number.

668353385 is a deficient number, since it is larger than the sum of its proper divisors (346426279).

668353385 is a wasteful number, since it uses less digits than its factorization.

668353385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410 (or 4403 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 47.

The square root of 668353385 is about 25852.5315008028. The cubic root of 668353385 is about 874.3165863627.

The spelling of 668353385 in words is "six hundred sixty-eight million, three hundred fifty-three thousand, three hundred eighty-five".