13161606640 has 80 divisors (see below), whose sum is σ = 37662464448. Its totient is φ = 4165429248.

The previous prime is 13161606607. The next prime is 13161606671. The reversal of 13161606640 is 4660616131.

13161606640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 13161606596 and 13161606605.

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 15 ways as a sum of consecutive naturals, for example, 896677 + ... + 911236.

Almost surely, 2^13161606640 is an apocalyptic number.

13161606640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13161606640 is an abundant number, since it is smaller than the sum of its proper divisors (24500857808).

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

13161606640 is a wasteful number, since it uses less digits than its factorization.

13161606640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807946 (or 1807940 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 13161606640 in words is "thirteen billion, one hundred sixty-one million, six hundred six thousand, six hundred forty".