669159531 has 6 divisors (see below), whose sum is σ = 966563780. Its totient is φ = 446106348.

The previous prime is 669159509. The next prime is 669159551. The reversal of 669159531 is 135951966.

669159531 is a `hidden beast` number, since 6 + 69 + 1 + 59 + 531 = 666.

669159531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669159531 - 2⁹ = 669159019 is a prime.

It is a super-2 number, since 2×669159531² = 895548955856279922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669159551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37175521 + ... + 37175538.

Almost surely, 2^669159531 is an apocalyptic number.

669159531 is a deficient number, since it is larger than the sum of its proper divisors (297404249).

669159531 is a wasteful number, since it uses less digits than its factorization.

669159531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74351065 (or 74351062 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 669159531 is about 25868.1180413265. The cubic root of 669159531 is about 874.6679691515.

The spelling of 669159531 in words is "six hundred sixty-nine million, one hundred fifty-nine thousand, five hundred thirty-one".