669346643966 has 192 divisors, whose sum is σ = 1440555217920. Its totient is φ = 226187596800.

The previous prime is 669346643963. The next prime is 669346643971.

669346643966 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669346643896 and 669346643905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669346643963) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 314098721 + ... + 314100851.

It is an arithmetic number, because the mean of its divisors is an integer number (7502891760).

Almost surely, 2^669346643966 is an apocalyptic number.

669346643966 is an abundant number, since it is smaller than the sum of its proper divisors (771208573954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669346643966 is a wasteful number, since it uses less digits than its factorization.

669346643966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031 (or 3020 counting only the distinct ones).

The product of its digits is 544195584, while the sum is 68.

The spelling of 669346643966 in words is "six hundred sixty-nine billion, three hundred forty-six million, six hundred forty-three thousand, nine hundred sixty-six".