12645747531 has 6 divisors (see below), whose sum is σ = 18266079780. Its totient is φ = 8430498348.

The previous prime is 12645747529. The next prime is 12645747533. The reversal of 12645747531 is 13574754621.

12645747531 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 574 + 75 + 3 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (12645747529) and next prime (12645747533).

It is not a de Polignac number, because 12645747531 - 2¹ = 12645747529 is a prime.

It is a super-2 number, since 2×12645747531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12645747533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 702541521 + ... + 702541538.

It is an arithmetic number, because the mean of its divisors is an integer number (3044346630).

Almost surely, 2^12645747531 is an apocalyptic number.

12645747531 is a deficient number, since it is larger than the sum of its proper divisors (5620332249).

12645747531 is a wasteful number, since it uses less digits than its factorization.

12645747531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405083065 (or 1405083062 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The spelling of 12645747531 in words is "twelve billion, six hundred forty-five million, seven hundred forty-seven thousand, five hundred thirty-one".