66199447964 has 48 divisors (see below), whose sum is σ = 132641312832. Its totient is φ = 28673728512.

The previous prime is 66199447957. The next prime is 66199447997. The reversal of 66199447964 is 46974499166.

It is a self number, because there is not a number n which added to its sum of digits gives 66199447964.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458789 + ... + 585564.

It is an arithmetic number, because the mean of its divisors is an integer number (2763360684).

Almost surely, 2^66199447964 is an apocalyptic number.

It is an amenable number.

66199447964 is an abundant number, since it is smaller than the sum of its proper divisors (66441864868).

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

66199447964 is a wasteful number, since it uses less digits than its factorization.

66199447964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044446 (or 1044444 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 65.

The spelling of 66199447964 in words is "sixty-six billion, one hundred ninety-nine million, four hundred forty-seven thousand, nine hundred sixty-four".