669888966 has 16 divisors (see below), whose sum is σ = 1410292800. Its totient is φ = 211543848.

The previous prime is 669888949. The next prime is 669888971.

669888966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669888897 and 669888906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2937996 + ... + 2938223.

It is an arithmetic number, because the mean of its divisors is an integer number (88143300).

Almost surely, 2^669888966 is an apocalyptic number.

669888966 is an abundant number, since it is smaller than the sum of its proper divisors (740403834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669888966 is a wasteful number, since it uses less digits than its factorization.

669888966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876243.

The product of its digits is 53747712, while the sum is 66.

The square root of 669888966 is about 25882.2133133934. The cubic root of 669888966 is about 874.9856720375.

The spelling of 669888966 in words is "six hundred sixty-nine million, eight hundred eighty-eight thousand, nine hundred sixty-six".