669353691 has 8 divisors (see below), whose sum is σ = 893251584. Its totient is φ = 445845800.

The previous prime is 669353689. The next prime is 669353723. The reversal of 669353691 is 196353966.

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

It is a cyclic number.

It is not a de Polignac number, because 669353691 - 2¹ = 669353689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669353691.

It is not an unprimeable number, because it can be changed into a prime (669353621) 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, 93471 + ... + 100376.

It is an arithmetic number, because the mean of its divisors is an integer number (111656448).

Almost surely, 2^669353691 is an apocalyptic number.

669353691 is a deficient number, since it is larger than the sum of its proper divisors (223897893).

669353691 is a wasteful number, since it uses less digits than its factorization.

669353691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195001.

The product of its digits is 787320, while the sum is 48.

The square root of 669353691 is about 25871.8706513464. The cubic root of 669353691 is about 874.7525574061.

The spelling of 669353691 in words is "six hundred sixty-nine million, three hundred fifty-three thousand, six hundred ninety-one".