13881864566 has 4 divisors (see below), whose sum is σ = 20822796852. Its totient is φ = 6940932282.

The previous prime is 13881864551. The next prime is 13881864589. The reversal of 13881864566 is 66546818831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66546818831 = 19 ⋅3502464149.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3470466140 + ... + 3470466143.

It is an arithmetic number, because the mean of its divisors is an integer number (5205699213).

Almost surely, 2^13881864566 is an apocalyptic number.

13881864566 is a deficient number, since it is larger than the sum of its proper divisors (6940932286).

13881864566 is an equidigital number, since it uses as much as digits as its factorization.

13881864566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6940932285.

The product of its digits is 6635520, while the sum is 56.

The spelling of 13881864566 in words is "thirteen billion, eight hundred eighty-one million, eight hundred sixty-four thousand, five hundred sixty-six".