13406265531 has 56 divisors (see below), whose sum is σ = 20784400560. Its totient is φ = 8637705216.

The previous prime is 13406265437. The next prime is 13406265539. The reversal of 13406265531 is 13556260431.

13406265531 is a `hidden beast` number, since 1 + 3 + 4 + 0 + 62 + 65 + 531 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-13406265531 is a prime.

It is a super-2 number, since 2×13406265531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13406265539) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3038455 + ... + 3042863.

It is an arithmetic number, because the mean of its divisors is an integer number (371150010).

Almost surely, 2^13406265531 is an apocalyptic number.

13406265531 is a deficient number, since it is larger than the sum of its proper divisors (7378135029).

13406265531 is an frugal number, since it uses more digits than its factorization.

13406265531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567 (or 4552 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 13406265531 in words is "thirteen billion, four hundred six million, two hundred sixty-five thousand, five hundred thirty-one".