16556142161765 has 8 divisors (see below), whose sum is σ = 20043188033688. Its totient is φ = 13127702103040.

The previous prime is 16556142161729. The next prime is 16556142161789. The reversal of 16556142161765 is 56716124165561.

It can be written as a sum of positive squares in 4 ways, for example, as 561949634689 + 15994192527076 = 749633^2 + 3999274^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16556142161765 - 2¹⁰ = 16556142160741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16556142161765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14651452676 + ... + 14651453805.

It is an arithmetic number, because the mean of its divisors is an integer number (2505398504211).

Almost surely, 2^{16556142161765} is an apocalyptic number.

It is an amenable number.

16556142161765 is a deficient number, since it is larger than the sum of its proper divisors (3487045871923).

16556142161765 is a wasteful number, since it uses less digits than its factorization.

16556142161765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29302906599.

The product of its digits is 9072000, while the sum is 56.

The spelling of 16556142161765 in words is "sixteen trillion, five hundred fifty-six billion, one hundred forty-two million, one hundred sixty-one thousand, seven hundred sixty-five".