13737781117 has 2 divisors, whose sum is σ = 13737781118. Its totient is φ = 13737781116.

The previous prime is 13737781111. The next prime is 13737781121. The reversal of 13737781117 is 71118773731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13110479001 + 627302116 = 114501^2 + 25046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13737781117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13737781111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6868890558 + 6868890559.

It is an arithmetic number, because the mean of its divisors is an integer number (6868890559).

Almost surely, 2^13737781117 is an apocalyptic number.

It is an amenable number.

13737781117 is a deficient number, since it is larger than the sum of its proper divisors (1).

13737781117 is an equidigital number, since it uses as much as digits as its factorization.

13737781117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172872, while the sum is 46.

The spelling of 13737781117 in words is "thirteen billion, seven hundred thirty-seven million, seven hundred eighty-one thousand, one hundred seventeen".