669991292 has 24 divisors (see below), whose sum is σ = 1215807600. Its totient is φ = 322672896.

The previous prime is 669991271. The next prime is 669991297. The reversal of 669991292 is 292199966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669991297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43559 + ... + 56897.

It is an arithmetic number, because the mean of its divisors is an integer number (50658650).

Almost surely, 2^669991292 is an apocalyptic number.

It is an amenable number.

669991292 is a deficient number, since it is larger than the sum of its proper divisors (545816308).

669991292 is a wasteful number, since it uses less digits than its factorization.

669991292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13805 (or 13803 counting only the distinct ones).

The product of its digits is 944784, while the sum is 53.

The square root of 669991292 is about 25884.1900008480. The cubic root of 669991292 is about 875.0302213235.

The spelling of 669991292 in words is "six hundred sixty-nine million, nine hundred ninety-one thousand, two hundred ninety-two".