16541321653165 has 8 divisors (see below), whose sum is σ = 19849655033208. Its totient is φ = 13233011289600.

The previous prime is 16541321653147. The next prime is 16541321653217. The reversal of 16541321653165 is 56135612314561.

It can be written as a sum of positive squares in 4 ways, for example, as 2512056992809 + 14029264660356 = 1584947^2 + 3745566^2 .

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

It is not a de Polignac number, because 16541321653165 - 2⁵ = 16541321653133 is a prime.

It is a Duffinian number.

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, 4131436 + ... + 7081765.

It is an arithmetic number, because the mean of its divisors is an integer number (2481206879151).

Almost surely, 2^{16541321653165} is an apocalyptic number.

It is an amenable number.

16541321653165 is a deficient number, since it is larger than the sum of its proper divisors (3308333380043).

16541321653165 is a wasteful number, since it uses less digits than its factorization.

16541321653165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11508239.

The product of its digits is 1944000, while the sum is 49.

The spelling of 16541321653165 in words is "sixteen trillion, five hundred forty-one billion, three hundred twenty-one million, six hundred fifty-three thousand, one hundred sixty-five".