665220174152 has 8 divisors (see below), whose sum is σ = 1247287826550. Its totient is φ = 332610087072.

The previous prime is 665220174149. The next prime is 665220174193. The reversal of 665220174152 is 251471022566.

It can be written as a sum of positive squares in only one way, i.e., 420881752516 + 244338421636 = 648754^2 + 494306^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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, 41576260877 + ... + 41576260892.

Almost surely, 2^665220174152 is an apocalyptic number.

It is an amenable number.

665220174152 is a deficient number, since it is larger than the sum of its proper divisors (582067652398).

665220174152 is a wasteful number, since it uses less digits than its factorization.

665220174152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83152521775 (or 83152521771 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 665220174152 in words is "six hundred sixty-five billion, two hundred twenty million, one hundred seventy-four thousand, one hundred fifty-two".