667181425825 has 12 divisors (see below), whose sum is σ = 875969966700. Its totient is φ = 502348367360.

The previous prime is 667181425751. The next prime is 667181425829. The reversal of 667181425825 is 528524181766.

It can be written as a sum of positive squares in 6 ways, for example, as 96800010129 + 570381415696 = 311127^2 + 755236^2 .

It is a de Polignac number, because none of the positive numbers 2^k-667181425825 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667181425829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 784918900 + ... + 784919749.

It is an arithmetic number, because the mean of its divisors is an integer number (72997497225).

Almost surely, 2^667181425825 is an apocalyptic number.

It is an amenable number.

667181425825 is a deficient number, since it is larger than the sum of its proper divisors (208788540875).

667181425825 is a wasteful number, since it uses less digits than its factorization.

667181425825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569838676 (or 1569838671 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 55.

The spelling of 667181425825 in words is "six hundred sixty-seven billion, one hundred eighty-one million, four hundred twenty-five thousand, eight hundred twenty-five".