66447171144 has 48 divisors (see below), whose sum is σ = 181378129920. Its totient is φ = 21974652000.

The previous prime is 66447171139. The next prime is 66447171163. The reversal of 66447171144 is 44117174466.

66447171144 is a `hidden beast` number, since 6 + 64 + 471 + 7 + 114 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66447171144.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3624232 + ... + 3642519.

It is an arithmetic number, because the mean of its divisors is an integer number (3778711040).

Almost surely, 2^66447171144 is an apocalyptic number.

It is an amenable number.

66447171144 is an abundant number, since it is smaller than the sum of its proper divisors (114930958776).

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

66447171144 is a wasteful number, since it uses less digits than its factorization.

66447171144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7266890 (or 7266883 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The spelling of 66447171144 in words is "sixty-six billion, four hundred forty-seven million, one hundred seventy-one thousand, one hundred forty-four".