13138661377 has 4 divisors (see below), whose sum is σ = 13162250196. Its totient is φ = 13115072560.

The previous prime is 13138661339. The next prime is 13138661387. The reversal of 13138661377 is 77316683131.

It is a Cunningham number, because it is equal to 114624²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1153009936 + 11985651441 = 33956^2 + 109479^2 .

It is a cyclic number.

It is not a de Polignac number, because 13138661377 - 2¹¹ = 13138659329 is a prime.

It is a super-2 number, since 2×13138661377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13138661387) 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, 11793574 + ... + 11794687.

It is an arithmetic number, because the mean of its divisors is an integer number (3290562549).

Almost surely, 2^13138661377 is an apocalyptic number.

It is an amenable number.

13138661377 is a deficient number, since it is larger than the sum of its proper divisors (23588819).

13138661377 is an equidigital number, since it uses as much as digits as its factorization.

13138661377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23588818.

The product of its digits is 381024, while the sum is 46.

The spelling of 13138661377 in words is "thirteen billion, one hundred thirty-eight million, six hundred sixty-one thousand, three hundred seventy-seven".