669524389 has 4 divisors (see below), whose sum is σ = 680872320. Its totient is φ = 658176460.

The previous prime is 669524377. The next prime is 669524473. The reversal of 669524389 is 983425966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983425966 = 2 ⋅491712983.

It is a cyclic number.

It is not a de Polignac number, because 669524389 - 2¹⁵ = 669491621 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 (669224389) 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, 5673877 + ... + 5673994.

It is an arithmetic number, because the mean of its divisors is an integer number (170218080).

Almost surely, 2^669524389 is an apocalyptic number.

It is an amenable number.

669524389 is a deficient number, since it is larger than the sum of its proper divisors (11347931).

669524389 is a wasteful number, since it uses less digits than its factorization.

669524389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11347930.

The product of its digits is 2799360, while the sum is 52.

The square root of 669524389 is about 25875.1693521028. The cubic root of 669524389 is about 874.8269106331.

The spelling of 669524389 in words is "six hundred sixty-nine million, five hundred twenty-four thousand, three hundred eighty-nine".