664557118 has 4 divisors (see below), whose sum is σ = 996835680. Its totient is φ = 332278558.

The previous prime is 664557107. The next prime is 664557139. The reversal of 664557118 is 811755466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 811755466 = 2 ⋅405877733.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166139278 + ... + 166139281.

It is an arithmetic number, because the mean of its divisors is an integer number (249208920).

Almost surely, 2^664557118 is an apocalyptic number.

664557118 is a deficient number, since it is larger than the sum of its proper divisors (332278562).

664557118 is a wasteful number, since it uses less digits than its factorization.

664557118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332278561.

The product of its digits is 201600, while the sum is 43.

The square root of 664557118 is about 25779.0053725895. The cubic root of 664557118 is about 872.6580608708.

The spelling of 664557118 in words is "six hundred sixty-four million, five hundred fifty-seven thousand, one hundred eighteen".