669427399 has 4 divisors (see below), whose sum is σ = 704660440. Its totient is φ = 634194360.

The previous prime is 669427391. The next prime is 669427403. The reversal of 669427399 is 993724966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669427399 - 2³ = 669427391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669427391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17616492 + ... + 17616529.

It is an arithmetic number, because the mean of its divisors is an integer number (176165110).

Almost surely, 2^669427399 is an apocalyptic number.

669427399 is a deficient number, since it is larger than the sum of its proper divisors (35233041).

669427399 is a wasteful number, since it uses less digits than its factorization.

669427399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35233040.

The product of its digits is 4408992, while the sum is 55.

The square root of 669427399 is about 25873.2950935902. The cubic root of 669427399 is about 874.7846649430.

The spelling of 669427399 in words is "six hundred sixty-nine million, four hundred twenty-seven thousand, three hundred ninety-nine".