13866401812 has 24 divisors (see below), whose sum is σ = 24525024104. Its totient is φ = 6859302912.

The previous prime is 13866401771. The next prime is 13866401827. The reversal of 13866401812 is 21810466831.

It can be written as a sum of positive squares in 4 ways, for example, as 5917609476 + 7948792336 = 76926^2 + 89156^2 .

It is a congruent 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, 1663078 + ... + 1671394.

Almost surely, 2^13866401812 is an apocalyptic number.

It is an amenable number.

13866401812 is a deficient number, since it is larger than the sum of its proper divisors (10658622292).

13866401812 is a wasteful number, since it uses less digits than its factorization.

13866401812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12715 (or 12713 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 13866401812 in words is "thirteen billion, eight hundred sixty-six million, four hundred one thousand, eight hundred twelve".