664125547 has 2 divisors, whose sum is σ = 664125548. Its totient is φ = 664125546.

The previous prime is 664125533. The next prime is 664125569. The reversal of 664125547 is 745521466.

It is a happy number.

664125547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664125547 is a prime.

It is not a weakly prime, because it can be changed into another prime (664125347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332062773 + 332062774.

It is an arithmetic number, because the mean of its divisors is an integer number (332062774).

Almost surely, 2^664125547 is an apocalyptic number.

664125547 is a deficient number, since it is larger than the sum of its proper divisors (1).

664125547 is an equidigital number, since it uses as much as digits as its factorization.

664125547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 40.

The square root of 664125547 is about 25770.6334225606. The cubic root of 664125547 is about 872.4691152523.

The spelling of 664125547 in words is "six hundred sixty-four million, one hundred twenty-five thousand, five hundred forty-seven".