664752071 has 8 divisors (see below), whose sum is σ = 708921360. Its totient is φ = 621145728.

The previous prime is 664752061. The next prime is 664752083. The reversal of 664752071 is 170257466.

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

It is a de Polignac number, because none of the positive numbers 2^k-664752071 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 (664752061) 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, 138296 + ... + 143021.

It is an arithmetic number, because the mean of its divisors is an integer number (88615170).

Almost surely, 2^664752071 is an apocalyptic number.

664752071 is a deficient number, since it is larger than the sum of its proper divisors (44169289).

664752071 is a wasteful number, since it uses less digits than its factorization.

664752071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281473.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 664752071 is about 25782.7863311939. The cubic root of 664752071 is about 872.7433862046.

The spelling of 664752071 in words is "six hundred sixty-four million, seven hundred fifty-two thousand, seventy-one".