13661774745 has 32 divisors (see below), whose sum is σ = 21976665600. Its totient is φ = 7247073024.

The previous prime is 13661774729. The next prime is 13661774771. The reversal of 13661774745 is 54747716631.

13661774745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13661774745 - 2⁴ = 13661774729 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5731824 + ... + 5734206.

It is an arithmetic number, because the mean of its divisors is an integer number (686770800).

Almost surely, 2^13661774745 is an apocalyptic number.

13661774745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13661774745 is a deficient number, since it is larger than the sum of its proper divisors (8314890855).

13661774745 is a wasteful number, since it uses less digits than its factorization.

13661774745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289.

The product of its digits is 2963520, while the sum is 51.

The spelling of 13661774745 in words is "thirteen billion, six hundred sixty-one million, seven hundred seventy-four thousand, seven hundred forty-five".