13640799787 has 2 divisors, whose sum is σ = 13640799788. Its totient is φ = 13640799786.

The previous prime is 13640799763. The next prime is 13640799841. The reversal of 13640799787 is 78799704631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13640799787 - 2²³ = 13632411179 is a prime.

It is not a weakly prime, because it can be changed into another prime (13640797787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820399893 + 6820399894.

It is an arithmetic number, because the mean of its divisors is an integer number (6820399894).

Almost surely, 2^13640799787 is an apocalyptic number.

13640799787 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640799787 is an equidigital number, since it uses as much as digits as its factorization.

13640799787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16003008, while the sum is 61.

The spelling of 13640799787 in words is "thirteen billion, six hundred forty million, seven hundred ninety-nine thousand, seven hundred eighty-seven".