667667725 has 12 divisors (see below), whose sum is σ = 856457460. Its totient is φ = 515715200.

The previous prime is 667667681. The next prime is 667667729. The reversal of 667667725 is 527766766.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 114618436 + 553049289 = 10706^2 + 23517^2 .

It is not a de Polignac number, because 667667725 - 2⁹ = 667667213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667667729) 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 11 ways as a sum of consecutive naturals, for example, 459736 + ... + 461185.

It is an arithmetic number, because the mean of its divisors is an integer number (71371455).

Almost surely, 2^667667725 is an apocalyptic number.

It is an amenable number.

667667725 is a deficient number, since it is larger than the sum of its proper divisors (188789735).

667667725 is a wasteful number, since it uses less digits than its factorization.

667667725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920960 (or 920955 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 52.

The square root of 667667725 is about 25839.2671142198. The cubic root of 667667725 is about 874.0174985631.

The spelling of 667667725 in words is "six hundred sixty-seven million, six hundred sixty-seven thousand, seven hundred twenty-five".