13640783437 has 2 divisors, whose sum is σ = 13640783438. Its totient is φ = 13640783436.

The previous prime is 13640783417. The next prime is 13640783467. The reversal of 13640783437 is 73438704631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11385103401 + 2255680036 = 106701^2 + 47494^2 .

It is an emirp because it is prime and its reverse (73438704631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13640783437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13640783417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820391718 + 6820391719.

It is an arithmetic number, because the mean of its divisors is an integer number (6820391719).

Almost surely, 2^13640783437 is an apocalyptic number.

It is an amenable number.

13640783437 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640783437 is an equidigital number, since it uses as much as digits as its factorization.

13640783437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 46.

The spelling of 13640783437 in words is "thirteen billion, six hundred forty million, seven hundred eighty-three thousand, four hundred thirty-seven".