13810137781 has 4 divisors (see below), whose sum is σ = 15065604864. Its totient is φ = 12554670700.

The previous prime is 13810137749. The next prime is 13810137791. The reversal of 13810137781 is 18773101831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13810137781 - 2⁵ = 13810137749 is a prime.

It is a super-2 number, since 2×13810137781² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13810137791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627733525 + ... + 627733546.

It is an arithmetic number, because the mean of its divisors is an integer number (3766401216).

Almost surely, 2^13810137781 is an apocalyptic number.

13810137781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13810137781 is a deficient number, since it is larger than the sum of its proper divisors (1255467083).

13810137781 is a wasteful number, since it uses less digits than its factorization.

13810137781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255467082.

The product of its (nonzero) digits is 28224, while the sum is 40.

The spelling of 13810137781 in words is "thirteen billion, eight hundred ten million, one hundred thirty-seven thousand, seven hundred eighty-one".