664718469 has 16 divisors (see below), whose sum is σ = 930009600. Its totient is φ = 421502576.

The previous prime is 664718429. The next prime is 664718473. The reversal of 664718469 is 964817466.

It is a cyclic number.

It is not a de Polignac number, because 664718469 - 2⁹ = 664717957 is a prime.

It is a super-2 number, since 2×664718469² = 883701286059407922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664718429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14559 + ... + 39260.

It is an arithmetic number, because the mean of its divisors is an integer number (58125600).

Almost surely, 2^664718469 is an apocalyptic number.

664718469 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

664718469 is a deficient number, since it is larger than the sum of its proper divisors (265291131).

664718469 is a wasteful number, since it uses less digits than its factorization.

664718469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54024.

The product of its digits is 1741824, while the sum is 51.

The square root of 664718469 is about 25782.1346866391. The cubic root of 664718469 is about 872.7286807634.

The spelling of 664718469 in words is "six hundred sixty-four million, seven hundred eighteen thousand, four hundred sixty-nine".