669929966 has 4 divisors (see below), whose sum is σ = 1004894952. Its totient is φ = 334964982.

The previous prime is 669929959. The next prime is 669929971.

669929966 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×669929966² = 897612318689522312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669929899 and 669929908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167482490 + ... + 167482493.

It is an arithmetic number, because the mean of its divisors is an integer number (251223738).

Almost surely, 2^669929966 is an apocalyptic number.

669929966 is a deficient number, since it is larger than the sum of its proper divisors (334964986).

669929966 is a wasteful number, since it uses less digits than its factorization.

669929966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334964985.

The product of its digits is 17006112, while the sum is 62.

The square root of 669929966 is about 25883.0053510020. The cubic root of 669929966 is about 875.0035225981.

The spelling of 669929966 in words is "six hundred sixty-nine million, nine hundred twenty-nine thousand, nine hundred sixty-six".