66181081924 has 24 divisors (see below), whose sum is σ = 116154019800. Its totient is φ = 32994278400.

The previous prime is 66181081907. The next prime is 66181081933. The reversal of 66181081924 is 42918018166.

66181081924 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19532857600 + 46648224324 = 139760^2 + 215982^2 .

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, 6419574 + ... + 6429874.

It is an arithmetic number, because the mean of its divisors is an integer number (4839750825).

Almost surely, 2^66181081924 is an apocalyptic number.

It is an amenable number.

66181081924 is a deficient number, since it is larger than the sum of its proper divisors (49972937876).

66181081924 is a wasteful number, since it uses less digits than its factorization.

66181081924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14823 (or 14821 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The spelling of 66181081924 in words is "sixty-six billion, one hundred eighty-one million, eighty-one thousand, nine hundred twenty-four".