669652387 has 2 divisors, whose sum is σ = 669652388. Its totient is φ = 669652386.

The previous prime is 669652367. The next prime is 669652391. The reversal of 669652387 is 783256966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669652387 - 2⁷ = 669652259 is a prime.

It is not a weakly prime, because it can be changed into another prime (669652367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334826193 + 334826194.

It is an arithmetic number, because the mean of its divisors is an integer number (334826194).

Almost surely, 2^669652387 is an apocalyptic number.

669652387 is a deficient number, since it is larger than the sum of its proper divisors (1).

669652387 is an equidigital number, since it uses as much as digits as its factorization.

669652387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 52.

The square root of 669652387 is about 25877.6426090168. The cubic root of 669652387 is about 874.8826561552.

The spelling of 669652387 in words is "six hundred sixty-nine million, six hundred fifty-two thousand, three hundred eighty-seven".