13678321537 has 4 divisors (see below), whose sum is σ = 13731544836. Its totient is φ = 13625098240.

The previous prime is 13678321523. The next prime is 13678321541. The reversal of 13678321537 is 73512387631.

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 8500655601 + 5177665936 = 92199^2 + 71956^2 .

It is a cyclic number.

It is not a de Polignac number, because 13678321537 - 2⁷ = 13678321409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13678321507) 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, 26611264 + ... + 26611777.

It is an arithmetic number, because the mean of its divisors is an integer number (3432886209).

Almost surely, 2^13678321537 is an apocalyptic number.

It is an amenable number.

13678321537 is a deficient number, since it is larger than the sum of its proper divisors (53223299).

13678321537 is an equidigital number, since it uses as much as digits as its factorization.

13678321537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53223298.

The product of its digits is 635040, while the sum is 46.

The spelling of 13678321537 in words is "thirteen billion, six hundred seventy-eight million, three hundred twenty-one thousand, five hundred thirty-seven".