66131856188 has 6 divisors (see below), whose sum is σ = 115730748336. Its totient is φ = 33065928092.

The previous prime is 66131856181. The next prime is 66131856199. The reversal of 66131856188 is 88165813166.

66131856188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66131856181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8266482020 + ... + 8266482027.

It is an arithmetic number, because the mean of its divisors is an integer number (19288458056).

Almost surely, 2^66131856188 is an apocalyptic number.

It is an amenable number.

66131856188 is a deficient number, since it is larger than the sum of its proper divisors (49598892148).

66131856188 is a wasteful number, since it uses less digits than its factorization.

66131856188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16532964051 (or 16532964049 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 53.

The spelling of 66131856188 in words is "sixty-six billion, one hundred thirty-one million, eight hundred fifty-six thousand, one hundred eighty-eight".