669965521187 has 2 divisors, whose sum is σ = 669965521188. Its totient is φ = 669965521186.

The previous prime is 669965521151. The next prime is 669965521193. The reversal of 669965521187 is 781125569966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669965521187 - 2¹⁶ = 669965455651 is a prime.

It is not a weakly prime, because it can be changed into another prime (669965521487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334982760593 + 334982760594.

It is an arithmetic number, because the mean of its divisors is an integer number (334982760594).

Almost surely, 2^669965521187 is an apocalyptic number.

669965521187 is a deficient number, since it is larger than the sum of its proper divisors (1).

669965521187 is an equidigital number, since it uses as much as digits as its factorization.

669965521187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48988800, while the sum is 65.

The spelling of 669965521187 in words is "six hundred sixty-nine billion, nine hundred sixty-five million, five hundred twenty-one thousand, one hundred eighty-seven".