668152685 has 4 divisors (see below), whose sum is σ = 801783228. Its totient is φ = 534522144.

The previous prime is 668152679. The next prime is 668152733. The reversal of 668152685 is 586251866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 520432969 + 147719716 = 22813^2 + 12154^2 .

It is a cyclic number.

It is not a de Polignac number, because 668152685 - 2²⁸ = 399717229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66815264 + ... + 66815273.

It is an arithmetic number, because the mean of its divisors is an integer number (200445807).

Almost surely, 2^668152685 is an apocalyptic number.

It is an amenable number.

668152685 is a deficient number, since it is larger than the sum of its proper divisors (133630543).

668152685 is a wasteful number, since it uses less digits than its factorization.

668152685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133630542.

The product of its digits is 691200, while the sum is 47.

The square root of 668152685 is about 25848.6495778793. The cubic root of 668152685 is about 874.2290613546.

The spelling of 668152685 in words is "six hundred sixty-eight million, one hundred fifty-two thousand, six hundred eighty-five".