661575176485 has 8 divisors (see below), whose sum is σ = 793966926456. Its totient is φ = 529208998080.

The previous prime is 661575176473. The next prime is 661575176531. The reversal of 661575176485 is 584671575166.

It can be written as a sum of positive squares in 4 ways, for example, as 43430143201 + 618145033284 = 208399^2 + 786222^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661575176485 - 2¹⁹ = 661574652197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6335926 + ... + 6439495.

It is an arithmetic number, because the mean of its divisors is an integer number (99245865807).

Almost surely, 2^661575176485 is an apocalyptic number.

It is an amenable number.

661575176485 is a deficient number, since it is larger than the sum of its proper divisors (132391749971).

661575176485 is a wasteful number, since it uses less digits than its factorization.

661575176485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12785783.

The product of its digits is 42336000, while the sum is 61.

The spelling of 661575176485 in words is "six hundred sixty-one billion, five hundred seventy-five million, one hundred seventy-six thousand, four hundred eighty-five".