13640542837 has 2 divisors, whose sum is σ = 13640542838. Its totient is φ = 13640542836.

The previous prime is 13640542831. The next prime is 13640542873. The reversal of 13640542837 is 73824504631.

Together with next prime (13640542873) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9484032996 + 4156509841 = 97386^2 + 64471^2 .

It is an emirp because it is prime and its reverse (73824504631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13640542837 - 2⁷ = 13640542709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13640542793 and 13640542802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13640542831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820271418 + 6820271419.

It is an arithmetic number, because the mean of its divisors is an integer number (6820271419).

Almost surely, 2^13640542837 is an apocalyptic number.

It is an amenable number.

13640542837 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640542837 is an equidigital number, since it uses as much as digits as its factorization.

13640542837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 13640542837 in words is "thirteen billion, six hundred forty million, five hundred forty-two thousand, eight hundred thirty-seven".