665622180176 has 10 divisors (see below), whose sum is σ = 1289642974122. Its totient is φ = 332811090080.

The previous prime is 665622180149. The next prime is 665622180211. The reversal of 665622180176 is 671081226566.

It can be written as a sum of positive squares in only one way, i.e., 649513493776 + 16108686400 = 805924^2 + 126920^2 .

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 as a sum of consecutive naturals, namely, 20800693115 + ... + 20800693146.

Almost surely, 2^665622180176 is an apocalyptic number.

It is an amenable number.

665622180176 is a deficient number, since it is larger than the sum of its proper divisors (624020793946).

665622180176 is a wasteful number, since it uses less digits than its factorization.

665622180176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41601386269 (or 41601386263 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 665622180176 in words is "six hundred sixty-five billion, six hundred twenty-two million, one hundred eighty thousand, one hundred seventy-six".