13654166221 has 4 divisors (see below), whose sum is σ = 13656475872. Its totient is φ = 13651856572.

The previous prime is 13654166209. The next prime is 13654166231. The reversal of 13654166221 is 12266145631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13654166221 - 2⁵ = 13654166189 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 (13654166231) 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, 1145935 + ... + 1157788.

It is an arithmetic number, because the mean of its divisors is an integer number (3414118968).

Almost surely, 2^13654166221 is an apocalyptic number.

It is an amenable number.

13654166221 is a deficient number, since it is larger than the sum of its proper divisors (2309651).

13654166221 is an equidigital number, since it uses as much as digits as its factorization.

13654166221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309650.

The product of its digits is 51840, while the sum is 37.

The spelling of 13654166221 in words is "thirteen billion, six hundred fifty-four million, one hundred sixty-six thousand, two hundred twenty-one".