664372547 has 2 divisors, whose sum is σ = 664372548. Its totient is φ = 664372546.

The previous prime is 664372531. The next prime is 664372567. The reversal of 664372547 is 745273466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664372547 - 2⁴ = 664372531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664372498 and 664372507.

It is not a weakly prime, because it can be changed into another prime (664372507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332186273 + 332186274.

It is an arithmetic number, because the mean of its divisors is an integer number (332186274).

Almost surely, 2^664372547 is an apocalyptic number.

664372547 is a deficient number, since it is larger than the sum of its proper divisors (1).

664372547 is an equidigital number, since it uses as much as digits as its factorization.

664372547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 44.

The square root of 664372547 is about 25775.4252535239. The cubic root of 664372547 is about 872.5772640613.

The spelling of 664372547 in words is "six hundred sixty-four million, three hundred seventy-two thousand, five hundred forty-seven".