66091544008 has 32 divisors (see below), whose sum is σ = 144638035200. Its totient is φ = 27722287872.

The previous prime is 66091543997. The next prime is 66091544027. The reversal of 66091544008 is 80044519066.

It is a super-2 number, since 2×66091544008² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12552753 + ... + 12558016.

It is an arithmetic number, because the mean of its divisors is an integer number (4519938600).

Almost surely, 2^66091544008 is an apocalyptic number.

It is an amenable number.

66091544008 is an abundant number, since it is smaller than the sum of its proper divisors (78546491192).

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

66091544008 is a wasteful number, since it uses less digits than its factorization.

66091544008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25110829 (or 25110825 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 66091544008 in words is "sixty-six billion, ninety-one million, five hundred forty-four thousand, eight".