66624181724 has 24 divisors (see below), whose sum is σ = 118389562368. Its totient is φ = 32799072240.

The previous prime is 66624181711. The next prime is 66624181751. The reversal of 66624181724 is 42718142666.

It is a happy number.

It is a super-2 number, since 2×66624181724² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506867 + ... + 624629.

It is an arithmetic number, because the mean of its divisors is an integer number (4932898432).

Almost surely, 2^66624181724 is an apocalyptic number.

It is an amenable number.

66624181724 is a deficient number, since it is larger than the sum of its proper divisors (51765380644).

66624181724 is a wasteful number, since it uses less digits than its factorization.

66624181724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119945 (or 119943 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The spelling of 66624181724 in words is "sixty-six billion, six hundred twenty-four million, one hundred eighty-one thousand, seven hundred twenty-four".