13660426640 has 160 divisors (see below), whose sum is σ = 37477363200. Its totient is φ = 4532723712.

The previous prime is 13660426631. The next prime is 13660426643. The reversal of 13660426640 is 4662406631.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13660426594 and 13660426603.

It is not an unprimeable number, because it can be changed into a prime (13660426643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4121624 + ... + 4124936.

It is an arithmetic number, because the mean of its divisors is an integer number (234233520).

Almost surely, 2^13660426640 is an apocalyptic number.

13660426640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13660426640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18738681600).

13660426640 is an abundant number, since it is smaller than the sum of its proper divisors (23816936560).

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

13660426640 is a wasteful number, since it uses less digits than its factorization.

13660426640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569 (or 3563 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 13660426640 in words is "thirteen billion, six hundred sixty million, four hundred twenty-six thousand, six hundred forty".