668005929 has 6 divisors (see below), whose sum is σ = 964897466. Its totient is φ = 445337280.

The previous prime is 668005913. The next prime is 668005931. The reversal of 668005929 is 929500866.

It can be written as a sum of positive squares in only one way, i.e., 366914025 + 301091904 = 19155^2 + 17352^2 .

It is not a de Polignac number, because 668005929 - 2⁴ = 668005913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668005979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37111432 + ... + 37111449.

Almost surely, 2^668005929 is an apocalyptic number.

It is an amenable number.

668005929 is a deficient number, since it is larger than the sum of its proper divisors (296891537).

668005929 is a wasteful number, since it uses less digits than its factorization.

668005929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74222887 (or 74222884 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 668005929 is about 25845.8106663343. The cubic root of 668005929 is about 874.1650501600.

The spelling of 668005929 in words is "six hundred sixty-eight million, five thousand, nine hundred twenty-nine".