669289547 has 2 divisors, whose sum is σ = 669289548. Its totient is φ = 669289546.

The previous prime is 669289493. The next prime is 669289589. The reversal of 669289547 is 745982966.

It is a happy number.

669289547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669289547 - 2⁶ = 669289483 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 669289492 and 669289501.

It is not a weakly prime, because it can be changed into another prime (669282547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334644773 + 334644774.

It is an arithmetic number, because the mean of its divisors is an integer number (334644774).

Almost surely, 2^669289547 is an apocalyptic number.

669289547 is a deficient number, since it is larger than the sum of its proper divisors (1).

669289547 is an equidigital number, since it uses as much as digits as its factorization.

669289547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 56.

The square root of 669289547 is about 25870.6309741374. The cubic root of 669289547 is about 874.7246140725.

The spelling of 669289547 in words is "six hundred sixty-nine million, two hundred eighty-nine thousand, five hundred forty-seven".