664542175 has 12 divisors (see below), whose sum is σ = 898944696. Its totient is φ = 483303200.

The previous prime is 664542149. The next prime is 664542217. The reversal of 664542175 is 571245466.

It is a happy number.

It is not a de Polignac number, because 664542175 - 2¹³ = 664533983 is a prime.

It is a Duffinian number.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 1207984 + ... + 1208533.

It is an arithmetic number, because the mean of its divisors is an integer number (74912058).

Almost surely, 2^664542175 is an apocalyptic number.

664542175 is a deficient number, since it is larger than the sum of its proper divisors (234402521).

664542175 is a wasteful number, since it uses less digits than its factorization.

664542175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416538 (or 2416533 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The square root of 664542175 is about 25778.7155420901. The cubic root of 664542175 is about 872.6515200600.

The spelling of 664542175 in words is "six hundred sixty-four million, five hundred forty-two thousand, one hundred seventy-five".