669131437 has 4 divisors (see below), whose sum is σ = 720603100. Its totient is φ = 617659776.

The previous prime is 669131431. The next prime is 669131443. The reversal of 669131437 is 734131966.

669131437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (669131431) and next prime (669131443).

It can be written as a sum of positive squares in 2 ways, for example, as 87067561 + 582063876 = 9331^2 + 24126^2 .

It is a cyclic number.

It is not a de Polignac number, because 669131437 - 2¹⁵ = 669098669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669131437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669131431) 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, 25735812 + ... + 25735837.

It is an arithmetic number, because the mean of its divisors is an integer number (180150775).

Almost surely, 2^669131437 is an apocalyptic number.

It is an amenable number.

669131437 is a deficient number, since it is larger than the sum of its proper divisors (51471663).

669131437 is a wasteful number, since it uses less digits than its factorization.

669131437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51471662.

The product of its digits is 81648, while the sum is 40.

The square root of 669131437 is about 25867.5750119720. The cubic root of 669131437 is about 874.6557282908.

The spelling of 669131437 in words is "six hundred sixty-nine million, one hundred thirty-one thousand, four hundred thirty-seven".