13888806581 has 16 divisors (see below), whose sum is σ = 15432958464. Its totient is φ = 12418251264.

The previous prime is 13888806571. The next prime is 13888806667. The reversal of 13888806581 is 18560888831.

It is a happy number.

It is not a de Polignac number, because 13888806581 - 2¹⁴ = 13888790197 is a prime.

It is a super-2 number, since 2×13888806581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13888806521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57905 + ... + 176438.

It is an arithmetic number, because the mean of its divisors is an integer number (964559904).

Almost surely, 2^13888806581 is an apocalyptic number.

It is an amenable number.

13888806581 is a deficient number, since it is larger than the sum of its proper divisors (1544151883).

13888806581 is a wasteful number, since it uses less digits than its factorization.

13888806581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234500.

The product of its (nonzero) digits is 2949120, while the sum is 56.

The spelling of 13888806581 in words is "thirteen billion, eight hundred eighty-eight million, eight hundred six thousand, five hundred eighty-one".