13661991229 has 4 divisors (see below), whose sum is σ = 13663598976. Its totient is φ = 13660383484.

The previous prime is 13661991223. The next prime is 13661991241. The reversal of 13661991229 is 92219916631.

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 13661991229 - 2¹¹ = 13661989181 is a prime.

It is a Smith number, since the sum of its digits (49) 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 not an unprimeable number, because it can be changed into a prime (13661991223) 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, 791059 + ... + 808144.

It is an arithmetic number, because the mean of its divisors is an integer number (3415899744).

Almost surely, 2^13661991229 is an apocalyptic number.

It is an amenable number.

13661991229 is a deficient number, since it is larger than the sum of its proper divisors (1607747).

13661991229 is an equidigital number, since it uses as much as digits as its factorization.

13661991229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607746.

The product of its digits is 314928, while the sum is 49.

The spelling of 13661991229 in words is "thirteen billion, six hundred sixty-one million, nine hundred ninety-one thousand, two hundred twenty-nine".