13977949566 has 16 divisors (see below), whose sum is σ = 31949599104. Its totient is φ = 3993699864.

The previous prime is 13977949523. The next prime is 13977949567. The reversal of 13977949566 is 66594977931.

It is a happy number.

13977949566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 13977949497 and 13977949506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13977949567) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 166404120 + ... + 166404203.

It is an arithmetic number, because the mean of its divisors is an integer number (1996849944).

Almost surely, 2^13977949566 is an apocalyptic number.

13977949566 is an abundant number, since it is smaller than the sum of its proper divisors (17971649538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13977949566 is a wasteful number, since it uses less digits than its factorization.

13977949566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332808335.

The product of its digits is 77157360, while the sum is 66.

The spelling of 13977949566 in words is "thirteen billion, nine hundred seventy-seven million, nine hundred forty-nine thousand, five hundred sixty-six".