668686725 has 96 divisors (see below), whose sum is σ = 1415504640. Its totient is φ = 303160320.

The previous prime is 668686723. The next prime is 668686729. The reversal of 668686725 is 527686866.

It is not a de Polignac number, because 668686725 - 2¹ = 668686723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668686723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 646809 + ... + 647841.

It is an arithmetic number, because the mean of its divisors is an integer number (14744840).

Almost surely, 2^668686725 is an apocalyptic number.

It is an amenable number.

668686725 is an abundant number, since it is smaller than the sum of its proper divisors (746817915).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668686725 is a wasteful number, since it uses less digits than its factorization.

668686725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196 (or 1185 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 668686725 is about 25858.9776480046. The cubic root of 668686725 is about 874.4619167914.

The spelling of 668686725 in words is "six hundred sixty-eight million, six hundred eighty-six thousand, seven hundred twenty-five".