669767899 has 4 divisors (see below), whose sum is σ = 674203600. Its totient is φ = 665332200.

The previous prime is 669767897. The next prime is 669767909. The reversal of 669767899 is 998767966.

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

It is a cyclic number.

It is not a de Polignac number, because 669767899 - 2¹ = 669767897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669767897) 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, 2217624 + ... + 2217925.

It is an arithmetic number, because the mean of its divisors is an integer number (168550900).

Almost surely, 2^669767899 is an apocalyptic number.

669767899 is a deficient number, since it is larger than the sum of its proper divisors (4435701).

669767899 is a wasteful number, since it uses less digits than its factorization.

669767899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4435700.

The product of its digits is 61725888, while the sum is 67.

The square root of 669767899 is about 25879.8744007771. The cubic root of 669767899 is about 874.9329576933.

Adding to 669767899 its sum of digits (67), we get a palindrome (669767966).

The spelling of 669767899 in words is "six hundred sixty-nine million, seven hundred sixty-seven thousand, eight hundred ninety-nine".