13655768381 has 4 divisors (see below), whose sum is σ = 14459048892. Its totient is φ = 12852487872.

The previous prime is 13655768363. The next prime is 13655768419. The reversal of 13655768381 is 18386755631.

It is a happy number.

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 4064700025 + 9591068356 = 63755^2 + 97934^2 .

It is a cyclic number.

It is not a de Polignac number, because 13655768381 - 2¹⁰ = 13655767357 is a prime.

It is a super-2 number, since 2×13655768381² (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 (13655768351) 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, 401640230 + ... + 401640263.

It is an arithmetic number, because the mean of its divisors is an integer number (3614762223).

Almost surely, 2^13655768381 is an apocalyptic number.

It is an amenable number.

13655768381 is a deficient number, since it is larger than the sum of its proper divisors (803280511).

13655768381 is an equidigital number, since it uses as much as digits as its factorization.

13655768381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803280510.

The product of its digits is 3628800, while the sum is 53.

The spelling of 13655768381 in words is "thirteen billion, six hundred fifty-five million, seven hundred sixty-eight thousand, three hundred eighty-one".