669142631 has 4 divisors (see below), whose sum is σ = 671612064. Its totient is φ = 666673200.

The previous prime is 669142567. The next prime is 669142637. The reversal of 669142631 is 136241966.

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

It is a cyclic number.

It is not a de Polignac number, because 669142631 - 2⁶ = 669142567 is a prime.

It is a super-2 number, since 2×669142631² = 895503721243204322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669142637) 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, 1234310 + ... + 1234851.

It is an arithmetic number, because the mean of its divisors is an integer number (167903016).

Almost surely, 2^669142631 is an apocalyptic number.

669142631 is a deficient number, since it is larger than the sum of its proper divisors (2469433).

669142631 is a wasteful number, since it uses less digits than its factorization.

669142631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469432.

The product of its digits is 46656, while the sum is 38.

The square root of 669142631 is about 25867.7913823349. The cubic root of 669142631 is about 874.6606056791.

The spelling of 669142631 in words is "six hundred sixty-nine million, one hundred forty-two thousand, six hundred thirty-one".