13281640516 has 27 divisors (see below), whose sum is σ = 24084107229. Its totient is φ = 6408599568.

The previous prime is 13281640499. The next prime is 13281640531. The reversal of 13281640516 is 61504618231.

It is a happy number.

The square root of 13281640516 is 115246.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6964570116 + 6317070400 = 83454^2 + 79480^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6683275 + ... + 6685261.

Almost surely, 2^13281640516 is an apocalyptic number.

13281640516 is the 115246-th square number.

It is an amenable number.

13281640516 is a deficient number, since it is larger than the sum of its proper divisors (10802466713).

13281640516 is an frugal number, since it uses more digits than its factorization.

13281640516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036 (or 2018 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 13281640516 in words is "thirteen billion, two hundred eighty-one million, six hundred forty thousand, five hundred sixteen".