661605660050 has 24 divisors (see below), whose sum is σ = 1239439681200. Its totient is φ = 262738360080.

The previous prime is 661605660049. The next prime is 661605660083. The reversal of 661605660050 is 50066506166.

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 in 11 ways as a sum of consecutive naturals, for example, 47590580 + ... + 47604479.

It is an arithmetic number, because the mean of its divisors is an integer number (51643320050).

Almost surely, 2^661605660050 is an apocalyptic number.

661605660050 is a deficient number, since it is larger than the sum of its proper divisors (577834021150).

661605660050 is a wasteful number, since it uses less digits than its factorization.

661605660050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95195210 (or 95195205 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 661605660050 in words is "six hundred sixty-one billion, six hundred five million, six hundred sixty thousand, fifty".