13661400440 has 32 divisors (see below), whose sum is σ = 31259142000. Its totient is φ = 5371939584.

The previous prime is 13661400427. The next prime is 13661400457. The reversal of 13661400440 is 4400416631.

13661400440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2892005 + ... + 2896724.

Almost surely, 2^13661400440 is an apocalyptic number.

13661400440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13661400440 is an abundant number, since it is smaller than the sum of its proper divisors (17597741560).

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

13661400440 is a wasteful number, since it uses less digits than its factorization.

13661400440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5788799 (or 5788795 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 13661400440 in words is "thirteen billion, six hundred sixty-one million, four hundred thousand, four hundred forty".