669142331 has 16 divisors (see below), whose sum is σ = 800966880. Its totient is φ = 550917120.

The previous prime is 669142319. The next prime is 669142343. The reversal of 669142331 is 133241966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (669142319) and next prime (669142343).

It is not a de Polignac number, because 669142331 - 2⁶ = 669142267 is a prime.

It is a super-2 number, since 2×669142331² = 895502918272227122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669142291 and 669142300.

It is not an unprimeable number, because it can be changed into a prime (669142391) 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 15 ways as a sum of consecutive naturals, for example, 36566 + ... + 51723.

It is an arithmetic number, because the mean of its divisors is an integer number (50060430).

Almost surely, 2^669142331 is an apocalyptic number.

669142331 is a deficient number, since it is larger than the sum of its proper divisors (131824549).

669142331 is a wasteful number, since it uses less digits than its factorization.

669142331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88366.

The product of its digits is 23328, while the sum is 35.

The square root of 669142331 is about 25867.7855836173. The cubic root of 669142331 is about 874.6604749655.

The spelling of 669142331 in words is "six hundred sixty-nine million, one hundred forty-two thousand, three hundred thirty-one".