669885547 has 2 divisors, whose sum is σ = 669885548. Its totient is φ = 669885546.

The previous prime is 669885509. The next prime is 669885553. The reversal of 669885547 is 745588966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669885547 - 2¹⁵ = 669852779 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 669885491 and 669885500.

It is not a weakly prime, because it can be changed into another prime (669885577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334942773 + 334942774.

It is an arithmetic number, because the mean of its divisors is an integer number (334942774).

Almost surely, 2^669885547 is an apocalyptic number.

669885547 is a deficient number, since it is larger than the sum of its proper divisors (1).

669885547 is an equidigital number, since it uses as much as digits as its factorization.

669885547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 58.

The square root of 669885547 is about 25882.1472640892. The cubic root of 669885547 is about 874.9841834420.

The spelling of 669885547 in words is "six hundred sixty-nine million, eight hundred eighty-five thousand, five hundred forty-seven".