13640978594 has 16 divisors (see below), whose sum is σ = 20669118840. Its totient is φ = 6751305600.

The previous prime is 13640978557. The next prime is 13640978597. The reversal of 13640978594 is 49587904631.

It can be written as a sum of positive squares in 4 ways, for example, as 8730472969 + 4910505625 = 93437^2 + 70075^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13640978597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1476662 + ... + 1485870.

Almost surely, 2^13640978594 is an apocalyptic number.

13640978594 is a deficient number, since it is larger than the sum of its proper divisors (7028140246).

13640978594 is a wasteful number, since it uses less digits than its factorization.

13640978594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16645.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 13640978594 in words is "thirteen billion, six hundred forty million, nine hundred seventy-eight thousand, five hundred ninety-four".