66185853081 has 16 divisors (see below), whose sum is σ = 88765805568. Its totient is φ = 43865193600.

The previous prime is 66185853077. The next prime is 66185853091. The reversal of 66185853081 is 18035858166.

It is not a de Polignac number, because 66185853081 - 2² = 66185853077 is a prime.

It is a super-2 number, since 2×66185853081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66185853001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 893205 + ... + 964461.

It is an arithmetic number, because the mean of its divisors is an integer number (5547862848).

Almost surely, 2^66185853081 is an apocalyptic number.

It is an amenable number.

66185853081 is a deficient number, since it is larger than the sum of its proper divisors (22579952487).

66185853081 is a wasteful number, since it uses less digits than its factorization.

66185853081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73072.

The product of its (nonzero) digits is 1382400, while the sum is 51.

The spelling of 66185853081 in words is "sixty-six billion, one hundred eighty-five million, eight hundred fifty-three thousand, eighty-one".