669866776880 has 40 divisors (see below), whose sum is σ = 1779931722912. Its totient is φ = 229668609024.

The previous prime is 669866776837. The next prime is 669866776883. The reversal of 669866776880 is 88677668966.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (669866776883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598094777 + ... + 598095896.

Almost surely, 2^669866776880 is an apocalyptic number.

It is an amenable number.

669866776880 is an abundant number, since it is smaller than the sum of its proper divisors (1110064946032).

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

669866776880 is a wasteful number, since it uses less digits than its factorization.

669866776880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196190693 (or 1196190687 counting only the distinct ones).

The product of its (nonzero) digits is 1755758592, while the sum is 77.

The spelling of 669866776880 in words is "six hundred sixty-nine billion, eight hundred sixty-six million, seven hundred seventy-six thousand, eight hundred eighty".