669020843 has 2 divisors, whose sum is σ = 669020844. Its totient is φ = 669020842.

The previous prime is 669020813. The next prime is 669020867. The reversal of 669020843 is 348020966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669020843 - 2¹⁶ = 668955307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669020797 and 669020806.

It is not a weakly prime, because it can be changed into another prime (669020813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334510421 + 334510422.

It is an arithmetic number, because the mean of its divisors is an integer number (334510422).

Almost surely, 2^669020843 is an apocalyptic number.

669020843 is a deficient number, since it is larger than the sum of its proper divisors (1).

669020843 is an equidigital number, since it uses as much as digits as its factorization.

669020843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 669020843 is about 25865.4372280849. The cubic root of 669020843 is about 874.6075379553.

The spelling of 669020843 in words is "six hundred sixty-nine million, twenty thousand, eight hundred forty-three".