661096796428 has 12 divisors (see below), whose sum is σ = 1185136940232. Its totient is φ = 322486242080.

The previous prime is 661096796417. The next prime is 661096796443. The reversal of 661096796428 is 824697690166.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 661096796428.

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 3 ways as a sum of consecutive naturals, for example, 2015538850 + ... + 2015539177.

It is an arithmetic number, because the mean of its divisors is an integer number (98761411686).

Almost surely, 2^661096796428 is an apocalyptic number.

It is an amenable number.

661096796428 is a deficient number, since it is larger than the sum of its proper divisors (524040143804).

661096796428 is a wasteful number, since it uses less digits than its factorization.

661096796428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031078072 (or 4031078070 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 64.

The spelling of 661096796428 in words is "six hundred sixty-one billion, ninety-six million, seven hundred ninety-six thousand, four hundred twenty-eight".