5661661551004 has 12 divisors (see below), whose sum is σ = 10043632477984. Its totient is φ = 2792052271584.

The previous prime is 5661661551001. The next prime is 5661661551067. The reversal of 5661661551004 is 4001551661665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661661551001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9694625652 + ... + 9694626235.

Almost surely, 2^{5661661551004} is an apocalyptic number.

It is an amenable number.

5661661551004 is a deficient number, since it is larger than the sum of its proper divisors (4381970926980).

5661661551004 is a wasteful number, since it uses less digits than its factorization.

5661661551004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19389251964 (or 19389251962 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 5661661551004 in words is "five trillion, six hundred sixty-one billion, six hundred sixty-one million, five hundred fifty-one thousand, four".