669493457 has 4 divisors (see below), whose sum is σ = 669559920. Its totient is φ = 669426996.

The previous prime is 669493417. The next prime is 669493463. The reversal of 669493457 is 754394966.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 669493457 - 2¹⁰ = 669492433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669493399 and 669493408.

It is not an unprimeable number, because it can be changed into a prime (669493417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14663 + ... + 39420.

It is an arithmetic number, because the mean of its divisors is an integer number (167389980).

Almost surely, 2^669493457 is an apocalyptic number.

It is an amenable number.

669493457 is a deficient number, since it is larger than the sum of its proper divisors (66463).

669493457 is a wasteful number, since it uses less digits than its factorization.

669493457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66462.

The product of its digits is 4898880, while the sum is 53.

The square root of 669493457 is about 25874.5716293043. The cubic root of 669493457 is about 874.8134381028.

The spelling of 669493457 in words is "six hundred sixty-nine million, four hundred ninety-three thousand, four hundred fifty-seven".