13231694440 has 32 divisors (see below), whose sum is σ = 29774956680. Its totient is φ = 5292029952.

The previous prime is 13231694387. The next prime is 13231694453. The reversal of 13231694440 is 4449613231.

It can be written as a sum of positive squares in 4 ways, for example, as 11849193316 + 1382501124 = 108854^2 + 37182^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13231694440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439552 + ... + 468688.

Almost surely, 2^13231694440 is an apocalyptic number.

13231694440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13231694440 is an abundant number, since it is smaller than the sum of its proper divisors (16543262240).

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

13231694440 is a wasteful number, since it uses less digits than its factorization.

13231694440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40501 (or 40497 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 13231694440 in words is "thirteen billion, two hundred thirty-one million, six hundred ninety-four thousand, four hundred forty".