664400271 has 8 divisors (see below), whose sum is σ = 886464000. Its totient is φ = 442635032.

The previous prime is 664400257. The next prime is 664400279. The reversal of 664400271 is 172004466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664400271 - 2¹¹ = 664398223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664400279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69375 + ... + 78368.

It is an arithmetic number, because the mean of its divisors is an integer number (110808000).

Almost surely, 2^664400271 is an apocalyptic number.

664400271 is a deficient number, since it is larger than the sum of its proper divisors (222063729).

664400271 is a wasteful number, since it uses less digits than its factorization.

664400271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149245.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 664400271 is about 25775.9630469940. The cubic root of 664400271 is about 872.5894013256.

The spelling of 664400271 in words is "six hundred sixty-four million, four hundred thousand, two hundred seventy-one".