66212805113 has 24 divisors (see below), whose sum is σ = 87827212872. Its totient is φ = 49306489344.

The previous prime is 66212805083. The next prime is 66212805119. The reversal of 66212805113 is 31150821266.

It can be written as a sum of positive squares in 4 ways, for example, as 14380086889 + 51832718224 = 119917^2 + 227668^2 .

It is not a de Polignac number, because 66212805113 - 2³⁴ = 49032935929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66212805119) 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 23 ways as a sum of consecutive naturals, for example, 3046370 + ... + 3068027.

It is an arithmetic number, because the mean of its divisors is an integer number (3659467203).

Almost surely, 2^66212805113 is an apocalyptic number.

It is an amenable number.

66212805113 is a deficient number, since it is larger than the sum of its proper divisors (21614407759).

66212805113 is a wasteful number, since it uses less digits than its factorization.

66212805113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114441 (or 6114434 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 66212805113 in words is "sixty-six billion, two hundred twelve million, eight hundred five thousand, one hundred thirteen".