664432555 has 8 divisors (see below), whose sum is σ = 808549344. Its totient is φ = 524059200.

The previous prime is 664432547. The next prime is 664432577. The reversal of 664432555 is 555234466.

It is a happy number.

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

It is not a de Polignac number, because 664432555 - 2³ = 664432547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 935466 + ... + 936175.

It is an arithmetic number, because the mean of its divisors is an integer number (101068668).

Almost surely, 2^664432555 is an apocalyptic number.

664432555 is a deficient number, since it is larger than the sum of its proper divisors (144116789).

664432555 is a wasteful number, since it uses less digits than its factorization.

664432555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871717.

The product of its digits is 432000, while the sum is 40.

The square root of 664432555 is about 25776.5892817494. The cubic root of 664432555 is about 872.6035344826.

The spelling of 664432555 in words is "six hundred sixty-four million, four hundred thirty-two thousand, five hundred fifty-five".