669142137 has 4 divisors (see below), whose sum is σ = 892189520. Its totient is φ = 446094756.

The previous prime is 669142129. The next prime is 669142141. The reversal of 669142137 is 731241966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 669142137 - 2³ = 669142129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669142095 and 669142104.

It is not an unprimeable number, because it can be changed into a prime (669142157) 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, 111523687 + ... + 111523692.

It is an arithmetic number, because the mean of its divisors is an integer number (223047380).

Almost surely, 2^669142137 is an apocalyptic number.

It is an amenable number.

669142137 is a deficient number, since it is larger than the sum of its proper divisors (223047383).

669142137 is a wasteful number, since it uses less digits than its factorization.

669142137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223047382.

The product of its digits is 54432, while the sum is 39.

The square root of 669142137 is about 25867.7818337793. The cubic root of 669142137 is about 874.6603904373.

It can be divided in two parts, 6691 and 42137, that added together give a triangular number (48828 = T₃₁₂).

The spelling of 669142137 in words is "six hundred sixty-nine million, one hundred forty-two thousand, one hundred thirty-seven".