13235061640 has 16 divisors (see below), whose sum is σ = 29778888780. Its totient is φ = 5294024640.

The previous prime is 13235061617. The next prime is 13235061643. The reversal of 13235061640 is 4616053231.

It can be written as a sum of positive squares in 2 ways, for example, as 11920709124 + 1314352516 = 109182^2 + 36254^2 .

It is a super-2 number, since 2×13235061640² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13235061643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165438231 + ... + 165438310.

Almost surely, 2^13235061640 is an apocalyptic number.

13235061640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13235061640 is an abundant number, since it is smaller than the sum of its proper divisors (16543827140).

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

13235061640 is a wasteful number, since it uses less digits than its factorization.

13235061640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330876552 (or 330876548 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 13235061640 in words is "thirteen billion, two hundred thirty-five million, sixty-one thousand, six hundred forty".