12536164643531 has 4 divisors (see below), whose sum is σ = 12537401815872. Its totient is φ = 12534927471192.

The previous prime is 12536164643491. The next prime is 12536164643539. The reversal of 12536164643531 is 13534646163521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12536164643531 - 2⁶ = 12536164643467 is a prime.

It is a super-2 number, since 2×12536164643531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12536164643531.

It is not an unprimeable number, because it can be changed into a prime (12536164643539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618570971 + ... + 618591236.

It is an arithmetic number, because the mean of its divisors is an integer number (3134350453968).

Almost surely, 2^{12536164643531} is an apocalyptic number.

12536164643531 is a deficient number, since it is larger than the sum of its proper divisors (1237172341).

12536164643531 is a wasteful number, since it uses less digits than its factorization.

12536164643531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237172340.

The product of its digits is 4665600, while the sum is 50.

The spelling of 12536164643531 in words is "twelve trillion, five hundred thirty-six billion, one hundred sixty-four million, six hundred forty-three thousand, five hundred thirty-one".