13401665521015 has 4 divisors (see below), whose sum is σ = 16081998625224. Its totient is φ = 10721332416808.

The previous prime is 13401665521009. The next prime is 13401665521021. The reversal of 13401665521015 is 51012556610431.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13401665521009) and next prime (13401665521021).

It is a cyclic number.

It is not a de Polignac number, because 13401665521015 - 2²⁷ = 13401531303287 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340166552097 + ... + 1340166552106.

It is an arithmetic number, because the mean of its divisors is an integer number (4020499656306).

Almost surely, 2^{13401665521015} is an apocalyptic number.

13401665521015 is a deficient number, since it is larger than the sum of its proper divisors (2680333104209).

13401665521015 is an equidigital number, since it uses as much as digits as its factorization.

13401665521015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680333104208.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 13401665521015 in words is "thirteen trillion, four hundred one billion, six hundred sixty-five million, five hundred twenty-one thousand, fifteen".