669289493 has 2 divisors, whose sum is σ = 669289494. Its totient is φ = 669289492.

The previous prime is 669289483. The next prime is 669289547. The reversal of 669289493 is 394982966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519520849 + 149768644 = 22793^2 + 12238^2 .

It is a cyclic number.

It is not a de Polignac number, because 669289493 - 2⁶ = 669289429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669289483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334644746 + 334644747.

It is an arithmetic number, because the mean of its divisors is an integer number (334644747).

Almost surely, 2^669289493 is an apocalyptic number.

It is an amenable number.

669289493 is a deficient number, since it is larger than the sum of its proper divisors (1).

669289493 is an equidigital number, since it uses as much as digits as its factorization.

669289493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5038848, while the sum is 56.

The square root of 669289493 is about 25870.6299304829. The cubic root of 669289493 is about 874.7245905475.

The spelling of 669289493 in words is "six hundred sixty-nine million, two hundred eighty-nine thousand, four hundred ninety-three".