66731724116 has 6 divisors (see below), whose sum is σ = 116780517210. Its totient is φ = 33365862056.

The previous prime is 66731724113. The next prime is 66731724139. The reversal of 66731724116 is 61142713766.

It can be written as a sum of positive squares in only one way, i.e., 48057408400 + 18674315716 = 219220^2 + 136654^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66731724113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8341465511 + ... + 8341465518.

It is an arithmetic number, because the mean of its divisors is an integer number (19463419535).

Almost surely, 2^66731724116 is an apocalyptic number.

It is an amenable number.

66731724116 is a deficient number, since it is larger than the sum of its proper divisors (50048793094).

66731724116 is a wasteful number, since it uses less digits than its factorization.

66731724116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16682931033 (or 16682931031 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The spelling of 66731724116 in words is "sixty-six billion, seven hundred thirty-one million, seven hundred twenty-four thousand, one hundred sixteen".