669969967 has 4 divisors (see below), whose sum is σ = 699099120. Its totient is φ = 640840816.

The previous prime is 669969947. The next prime is 669969973. The reversal of 669969967 is 769969966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 769969966 = 2 ⋅384984983.

It is a cyclic number.

It is not a de Polignac number, because 669969967 - 2¹¹ = 669967919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669969947) 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, 14564542 + ... + 14564587.

It is an arithmetic number, because the mean of its divisors is an integer number (174774780).

Almost surely, 2^669969967 is an apocalyptic number.

669969967 is a deficient number, since it is larger than the sum of its proper divisors (29129153).

669969967 is a wasteful number, since it uses less digits than its factorization.

669969967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29129152.

The product of its digits is 59521392, while the sum is 67.

The square root of 669969967 is about 25883.7780665806. The cubic root of 669969967 is about 875.0209375126.

Subtracting 669969967 from its reverse (769969966), we obtain a palindrome (99999999).

The spelling of 669969967 in words is "six hundred sixty-nine million, nine hundred sixty-nine thousand, nine hundred sixty-seven".