16451373221165 has 8 divisors (see below), whose sum is σ = 19742157730680. Its totient is φ = 13160758666752.

The previous prime is 16451373221161. The next prime is 16451373221167. The reversal of 16451373221165 is 56112237315461.

16451373221165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 465338172649 + 15986035048516 = 682157^2 + 3998254^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16451373221165 - 2² = 16451373221161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16451373221161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42275720 + ... + 42663089.

It is an arithmetic number, because the mean of its divisors is an integer number (2467769716335).

Almost surely, 2^{16451373221165} is an apocalyptic number.

It is an amenable number.

16451373221165 is a deficient number, since it is larger than the sum of its proper divisors (3290784509515).

16451373221165 is an equidigital number, since it uses as much as digits as its factorization.

16451373221165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84977551.

The product of its digits is 907200, while the sum is 47.

The spelling of 16451373221165 in words is "sixteen trillion, four hundred fifty-one billion, three hundred seventy-three million, two hundred twenty-one thousand, one hundred sixty-five".