13615564614421 has 16 divisors (see below), whose sum is σ = 16975355420160. Its totient is φ = 10609464599280.

The previous prime is 13615564614419. The next prime is 13615564614427. The reversal of 13615564614421 is 12441646551631.

It is a cyclic number.

It is not a de Polignac number, because 13615564614421 - 2¹ = 13615564614419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13615564614427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14503450 + ... + 15413668.

It is an arithmetic number, because the mean of its divisors is an integer number (1060959713760).

Almost surely, 2^{13615564614421} is an apocalyptic number.

13615564614421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13615564614421 is a deficient number, since it is larger than the sum of its proper divisors (3359790805739).

13615564614421 is a wasteful number, since it uses less digits than its factorization.

13615564614421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104504.

The product of its digits is 2073600, while the sum is 49.

The spelling of 13615564614421 in words is "thirteen trillion, six hundred fifteen billion, five hundred sixty-four million, six hundred fourteen thousand, four hundred twenty-one".