5661511642645 has 16 divisors (see below), whose sum is σ = 7103997250560. Its totient is φ = 4323242687104.

The previous prime is 5661511642481. The next prime is 5661511642667. The reversal of 5661511642645 is 5462461151665.

It is a cyclic number.

It is not a de Polignac number, because 5661511642645 - 2⁹ = 5661511642133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5661511642592 and 5661511642601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51333784 + ... + 51443953.

It is an arithmetic number, because the mean of its divisors is an integer number (443999828160).

Almost surely, 2^{5661511642645} is an apocalyptic number.

It is an amenable number.

5661511642645 is a deficient number, since it is larger than the sum of its proper divisors (1442485607915).

5661511642645 is a wasteful number, since it uses less digits than its factorization.

5661511642645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102778244.

The product of its digits is 5184000, while the sum is 52.

The spelling of 5661511642645 in words is "five trillion, six hundred sixty-one billion, five hundred eleven million, six hundred forty-two thousand, six hundred forty-five".