13181185064 has 8 divisors (see below), whose sum is σ = 24714722010. Its totient is φ = 6590592528.

The previous prime is 13181185063. The next prime is 13181185081. The reversal of 13181185064 is 46058118131.

It can be written as a sum of positive squares in only one way, i.e., 11267822500 + 1913362564 = 106150^2 + 43742^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (13181185063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823824059 + ... + 823824074.

Almost surely, 2^13181185064 is an apocalyptic number.

It is an amenable number.

13181185064 is a deficient number, since it is larger than the sum of its proper divisors (11533536946).

13181185064 is a wasteful number, since it uses less digits than its factorization.

13181185064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647648139 (or 1647648135 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 13181185064 in words is "thirteen billion, one hundred eighty-one million, one hundred eighty-five thousand, sixty-four".