16520661667765 has 32 divisors (see below), whose sum is σ = 20482666110720. Its totient is φ = 12785079430656.

The previous prime is 16520661667681. The next prime is 16520661667793. The reversal of 16520661667765 is 56776616602561.

16520661667765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16520661667765 - 2⁹ = 16520661667253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16520661667697 and 16520661667706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56011446 + ... + 56305624.

It is an arithmetic number, because the mean of its divisors is an integer number (640083315960).

Almost surely, 2^{16520661667765} is an apocalyptic number.

It is an amenable number.

16520661667765 is a deficient number, since it is larger than the sum of its proper divisors (3962004442955).

16520661667765 is a wasteful number, since it uses less digits than its factorization.

16520661667765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297213.

The product of its (nonzero) digits is 114307200, while the sum is 64.

The spelling of 16520661667765 in words is "sixteen trillion, five hundred twenty billion, six hundred sixty-one million, six hundred sixty-seven thousand, seven hundred sixty-five".