13664697 has 4 divisors (see below), whose sum is σ = 18219600. Its totient is φ = 9109796.

The previous prime is 13664657. The next prime is 13664711. The reversal of 13664697 is 79646631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13664697 - 2⁷ = 13664569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13664627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277447 + ... + 2277452.

It is an arithmetic number, because the mean of its divisors is an integer number (4554900).

Almost surely, 2^13664697 is an apocalyptic number.

It is an amenable number.

13664697 is a deficient number, since it is larger than the sum of its proper divisors (4554903).

13664697 is an equidigital number, since it uses as much as digits as its factorization.

13664697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554902.

The product of its digits is 163296, while the sum is 42.

The square root of 13664697 is about 3696.5790942438. The cubic root of 13664697 is about 239.0745436027.

The spelling of 13664697 in words is "thirteen million, six hundred sixty-four thousand, six hundred ninety-seven".