669787966 has 8 divisors (see below), whose sum is σ = 1010233224. Its totient is φ = 333043560.

The previous prime is 669787961. The next prime is 669787997.

669787966 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 669787898 and 669787907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669787961) 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, 924760 + ... + 925483.

It is an arithmetic number, because the mean of its divisors is an integer number (126279153).

Almost surely, 2^669787966 is an apocalyptic number.

669787966 is a deficient number, since it is larger than the sum of its proper divisors (340445258).

669787966 is a wasteful number, since it uses less digits than its factorization.

669787966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850426.

The product of its digits is 41150592, while the sum is 64.

The square root of 669787966 is about 25880.2620929542. The cubic root of 669787966 is about 874.9416955980.

The spelling of 669787966 in words is "six hundred sixty-nine million, seven hundred eighty-seven thousand, nine hundred sixty-six".