13661187377 has 4 divisors (see below), whose sum is σ = 13825780080. Its totient is φ = 13496594676.

The previous prime is 13661187349. The next prime is 13661187427. The reversal of 13661187377 is 77378116631.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77378116631 = 149 ⋅519316219.

It is a cyclic number.

It is not a de Polignac number, because 13661187377 - 2¹⁰ = 13661186353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13661187317) 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, 82296227 + ... + 82296392.

It is an arithmetic number, because the mean of its divisors is an integer number (3456445020).

Almost surely, 2^13661187377 is an apocalyptic number.

It is an amenable number.

13661187377 is a deficient number, since it is larger than the sum of its proper divisors (164592703).

13661187377 is an equidigital number, since it uses as much as digits as its factorization.

13661187377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164592702.

The product of its digits is 889056, while the sum is 50.

The spelling of 13661187377 in words is "thirteen billion, six hundred sixty-one million, one hundred eighty-seven thousand, three hundred seventy-seven".