668333810 has 8 divisors (see below), whose sum is σ = 1203000876. Its totient is φ = 267333520.

The previous prime is 668333803. The next prime is 668333819. The reversal of 668333810 is 18333866.

It can be written as a sum of positive squares in 2 ways, for example, as 629558281 + 38775529 = 25091^2 + 6227^2 .

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

It is a super-2 number, since 2×668333810² = 893340163178232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668333819) 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, 33416681 + ... + 33416700.

Almost surely, 2^668333810 is an apocalyptic number.

668333810 is a deficient number, since it is larger than the sum of its proper divisors (534667066).

668333810 is a wasteful number, since it uses less digits than its factorization.

668333810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66833388.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 668333810 is about 25852.1529084136. The cubic root of 668333810 is about 874.3080505020.

The spelling of 668333810 in words is "six hundred sixty-eight million, three hundred thirty-three thousand, eight hundred ten".