664132547 has 4 divisors (see below), whose sum is σ = 715219680. Its totient is φ = 613045416.

The previous prime is 664132487. The next prime is 664132577. The reversal of 664132547 is 745231466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664132547 - 2¹⁴ = 664116163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664132547.

It is not an unprimeable number, because it can be changed into a prime (664132577) 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, 25543547 + ... + 25543572.

It is an arithmetic number, because the mean of its divisors is an integer number (178804920).

Almost surely, 2^664132547 is an apocalyptic number.

664132547 is a deficient number, since it is larger than the sum of its proper divisors (51087133).

664132547 is a wasteful number, since it uses less digits than its factorization.

664132547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51087132.

The product of its digits is 120960, while the sum is 38.

The square root of 664132547 is about 25770.7692357058. The cubic root of 664132547 is about 872.4721805674.

The spelling of 664132547 in words is "six hundred sixty-four million, one hundred thirty-two thousand, five hundred forty-seven".