669191608291 has 16 divisors (see below), whose sum is σ = 710403667200. Its totient is φ = 628997881248.

The previous prime is 669191608289. The next prime is 669191608321. The reversal of 669191608291 is 192806191966.

It is a cyclic number.

It is not a de Polignac number, because 669191608291 - 2¹ = 669191608289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669191600291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3373420 + ... + 3566278.

It is an arithmetic number, because the mean of its divisors is an integer number (44400229200).

Almost surely, 2^669191608291 is an apocalyptic number.

669191608291 is a deficient number, since it is larger than the sum of its proper divisors (41212058909).

669191608291 is a wasteful number, since it uses less digits than its factorization.

669191608291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195498.

The product of its (nonzero) digits is 2519424, while the sum is 58.

The spelling of 669191608291 in words is "six hundred sixty-nine billion, one hundred ninety-one million, six hundred eight thousand, two hundred ninety-one".