13664406647 has 2 divisors, whose sum is σ = 13664406648. Its totient is φ = 13664406646.

The previous prime is 13664406541. The next prime is 13664406653. The reversal of 13664406647 is 74660446631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13664406647 - 2¹⁴ = 13664390263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13664406247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6832203323 + 6832203324.

It is an arithmetic number, because the mean of its divisors is an integer number (6832203324).

Almost surely, 2^13664406647 is an apocalyptic number.

13664406647 is a deficient number, since it is larger than the sum of its proper divisors (1).

13664406647 is an equidigital number, since it uses as much as digits as its factorization.

13664406647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 47.

The spelling of 13664406647 in words is "thirteen billion, six hundred sixty-four million, four hundred six thousand, six hundred forty-seven".