13820866385 has 8 divisors (see below), whose sum is σ = 16589471976. Its totient is φ = 11053738240.

The previous prime is 13820866349. The next prime is 13820866459. The reversal of 13820866385 is 58366802831.

It can be written as a sum of positive squares in 4 ways, for example, as 1789628416 + 12031237969 = 42304^2 + 109687^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-13820866385 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348674 + ... + 386283.

It is an arithmetic number, because the mean of its divisors is an integer number (2073683997).

Almost surely, 2^13820866385 is an apocalyptic number.

It is an amenable number.

13820866385 is a deficient number, since it is larger than the sum of its proper divisors (2768605591).

13820866385 is an equidigital number, since it uses as much as digits as its factorization.

13820866385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738723.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 13820866385 in words is "thirteen billion, eight hundred twenty million, eight hundred sixty-six thousand, three hundred eighty-five".