669676123 has 4 divisors (see below), whose sum is σ = 669740688. Its totient is φ = 669611560.

The previous prime is 669676103. The next prime is 669676129. The reversal of 669676123 is 321676966.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 669676123 - 2²¹ = 667578971 is a prime.

It is a super-2 number, since 2×669676123² = 896932219432622258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669676129) 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, 12808 + ... + 38773.

It is an arithmetic number, because the mean of its divisors is an integer number (167435172).

Almost surely, 2^669676123 is an apocalyptic number.

669676123 is a deficient number, since it is larger than the sum of its proper divisors (64565).

669676123 is a wasteful number, since it uses less digits than its factorization.

669676123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64564.

The product of its digits is 489888, while the sum is 46.

The square root of 669676123 is about 25878.1012247808. The cubic root of 669676123 is about 874.8929928462.

The spelling of 669676123 in words is "six hundred sixty-nine million, six hundred seventy-six thousand, one hundred twenty-three".