664248671 has 8 divisors (see below), whose sum is σ = 693429984. Its totient is φ = 635092480.

The previous prime is 664248647. The next prime is 664248677. The reversal of 664248671 is 176842466.

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 664248671 - 2¹⁴ = 664232287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664248677) 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, 65195 + ... + 74691.

It is an arithmetic number, because the mean of its divisors is an integer number (86678748).

Almost surely, 2^664248671 is an apocalyptic number.

664248671 is a deficient number, since it is larger than the sum of its proper divisors (29181313).

664248671 is a wasteful number, since it uses less digits than its factorization.

664248671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12561.

The product of its digits is 387072, while the sum is 44.

The square root of 664248671 is about 25773.0221549589. The cubic root of 664248671 is about 872.5230283766.

The spelling of 664248671 in words is "six hundred sixty-four million, two hundred forty-eight thousand, six hundred seventy-one".