667542725 has 6 divisors (see below), whose sum is σ = 827753010. Its totient is φ = 534034160.

The previous prime is 667542709. The next prime is 667542727. The reversal of 667542725 is 527245766.

It can be written as a sum of positive squares in 3 ways, for example, as 27604516 + 639938209 = 5254^2 + 25297^2 .

It is not a de Polignac number, because 667542725 - 2⁴ = 667542709 is a prime.

It is a super-2 number, since 2×667542725² = 891226579400851250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667542727) 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, 13350830 + ... + 13350879.

It is an arithmetic number, because the mean of its divisors is an integer number (137958835).

Almost surely, 2^667542725 is an apocalyptic number.

It is an amenable number.

667542725 is a deficient number, since it is larger than the sum of its proper divisors (160210285).

667542725 is a wasteful number, since it uses less digits than its factorization.

667542725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26701719 (or 26701714 counting only the distinct ones).

The product of its digits is 705600, while the sum is 44.

The square root of 667542725 is about 25836.8482017447. The cubic root of 667542725 is about 873.9629509681.

The spelling of 667542725 in words is "six hundred sixty-seven million, five hundred forty-two thousand, seven hundred twenty-five".