667995447 has 32 divisors (see below), whose sum is σ = 1056305152. Its totient is φ = 367524864.

The previous prime is 667995437. The next prime is 667995451. The reversal of 667995447 is 744599766.

It is not a de Polignac number, because 667995447 - 2⁴ = 667995431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667995437) 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 31 ways as a sum of consecutive naturals, for example, 70938 + ... + 79800.

It is an arithmetic number, because the mean of its divisors is an integer number (33009536).

Almost surely, 2^667995447 is an apocalyptic number.

667995447 is a deficient number, since it is larger than the sum of its proper divisors (388309705).

667995447 is a wasteful number, since it uses less digits than its factorization.

667995447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9007.

The product of its digits is 11430720, while the sum is 57.

The square root of 667995447 is about 25845.6078860606. The cubic root of 667995447 is about 874.1604778224.

The spelling of 667995447 in words is "six hundred sixty-seven million, nine hundred ninety-five thousand, four hundred forty-seven".