669020971 has 2 divisors, whose sum is σ = 669020972. Its totient is φ = 669020970.

The previous prime is 669020959. The next prime is 669021007. The reversal of 669020971 is 179020966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669020971 - 2⁷ = 669020843 is a prime.

It is not a weakly prime, because it can be changed into another prime (669020071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334510485 + 334510486.

It is an arithmetic number, because the mean of its divisors is an integer number (334510486).

Almost surely, 2^669020971 is an apocalyptic number.

669020971 is a deficient number, since it is larger than the sum of its proper divisors (1).

669020971 is an equidigital number, since it uses as much as digits as its factorization.

669020971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 669020971 is about 25865.4397024292. The cubic root of 669020971 is about 874.6075937332.

The spelling of 669020971 in words is "six hundred sixty-nine million, twenty thousand, nine hundred seventy-one".