66064871412 has 18 divisors (see below), whose sum is σ = 166997313938. Its totient is φ = 22021623792.

The previous prime is 66064871401. The next prime is 66064871413. The reversal of 66064871412 is 21417846066.

It can be written as a sum of positive squares in only one way, i.e., 50438871396 + 15626000016 = 224586^2 + 125004^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66064871413) 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 5 ways as a sum of consecutive naturals, for example, 917567623 + ... + 917567694.

Almost surely, 2^66064871412 is an apocalyptic number.

It is an amenable number.

66064871412 is an abundant number, since it is smaller than the sum of its proper divisors (100932442526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66064871412 is a wasteful number, since it uses less digits than its factorization.

66064871412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835135327 (or 1835135322 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 66064871412 in words is "sixty-six billion, sixty-four million, eight hundred seventy-one thousand, four hundred twelve".