12731213664 has 96 divisors (see below), whose sum is σ = 39989103840. Its totient is φ = 3917293056.

The previous prime is 12731213639. The next prime is 12731213669. The reversal of 12731213664 is 46631213721.

12731213664 is a `hidden beast` number, since 1 + 273 + 1 + 21 + 366 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731213669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 555507 + ... + 577970.

It is an arithmetic number, because the mean of its divisors is an integer number (416553165).

Almost surely, 2^12731213664 is an apocalyptic number.

It is an amenable number.

12731213664 is an abundant number, since it is smaller than the sum of its proper divisors (27257890176).

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

12731213664 is a wasteful number, since it uses less digits than its factorization.

12731213664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133509 (or 1133495 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The spelling of 12731213664 in words is "twelve billion, seven hundred thirty-one million, two hundred thirteen thousand, six hundred sixty-four".