665172601118 has 4 divisors (see below), whose sum is σ = 997758901680. Its totient is φ = 332586300558.

The previous prime is 665172601063. The next prime is 665172601127. The reversal of 665172601118 is 811106271566.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166293150278 + ... + 166293150281.

It is an arithmetic number, because the mean of its divisors is an integer number (249439725420).

Almost surely, 2^665172601118 is an apocalyptic number.

665172601118 is a deficient number, since it is larger than the sum of its proper divisors (332586300562).

665172601118 is a wasteful number, since it uses less digits than its factorization.

665172601118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332586300561.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 665172601118 in words is "six hundred sixty-five billion, one hundred seventy-two million, six hundred one thousand, one hundred eighteen".