13640542813 has 2 divisors, whose sum is σ = 13640542814. Its totient is φ = 13640542812.

The previous prime is 13640542789. The next prime is 13640542831. The reversal of 13640542813 is 31824504631.

Together with next prime (13640542831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8616851929 + 5023690884 = 92827^2 + 70878^2 .

It is a cyclic number.

It is not a de Polignac number, because 13640542813 - 2²¹ = 13638445661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13640542873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820271406 + 6820271407.

It is an arithmetic number, because the mean of its divisors is an integer number (6820271407).

Almost surely, 2^13640542813 is an apocalyptic number.

It is an amenable number.

13640542813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640542813 is an equidigital number, since it uses as much as digits as its factorization.

13640542813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 13640542813 in words is "thirteen billion, six hundred forty million, five hundred forty-two thousand, eight hundred thirteen".