669637145 has 4 divisors (see below), whose sum is σ = 803564580. Its totient is φ = 535709712.

The previous prime is 669637109. The next prime is 669637181. The reversal of 669637145 is 541736966.

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

It is an interprime number because it is at equal distance from previous prime (669637109) and next prime (669637181).

It can be written as a sum of positive squares in 2 ways, for example, as 173817856 + 495819289 = 13184^2 + 22267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669637145 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669637145.

It is an unprimeable number.

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, 66963710 + ... + 66963719.

It is an arithmetic number, because the mean of its divisors is an integer number (200891145).

Almost surely, 2^669637145 is an apocalyptic number.

It is an amenable number.

669637145 is a deficient number, since it is larger than the sum of its proper divisors (133927435).

669637145 is a wasteful number, since it uses less digits than its factorization.

669637145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133927434.

The product of its digits is 816480, while the sum is 47.

The square root of 669637145 is about 25877.3481060174. The cubic root of 669637145 is about 874.8760183518.

The spelling of 669637145 in words is "six hundred sixty-nine million, six hundred thirty-seven thousand, one hundred forty-five".