13446864431 has 24 divisors (see below), whose sum is σ = 18191322912. Its totient is φ = 9672062400.

The previous prime is 13446864413. The next prime is 13446864437.

13446864431 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 13446864431 - 2²² = 13442670127 is a prime.

It is a super-2 number, since 2×13446864431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13446864437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 599600 + ... + 621621.

It is an arithmetic number, because the mean of its divisors is an integer number (757971788).

Almost surely, 2^13446864431 is an apocalyptic number.

13446864431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13446864431 is a deficient number, since it is larger than the sum of its proper divisors (4744458481).

13446864431 is a wasteful number, since it uses less digits than its factorization.

13446864431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221263 (or 1221252 counting only the distinct ones).

The product of its digits is 663552, while the sum is 44.

The spelling of 13446864431 in words is "thirteen billion, four hundred forty-six million, eight hundred sixty-four thousand, four hundred thirty-one".