16545126171721 has 8 divisors (see below), whose sum is σ = 18911165954240. Its totient is φ = 14179698971568.

The previous prime is 16545126171709. The next prime is 16545126171727. The reversal of 16545126171721 is 12717162154561.

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 16545126171721 - 2¹⁷ = 16545126040649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16545126171727) 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, 153087711 + ... + 153195748.

It is an arithmetic number, because the mean of its divisors is an integer number (2363895744280).

Almost surely, 2^{16545126171721} is an apocalyptic number.

It is an amenable number.

16545126171721 is a deficient number, since it is larger than the sum of its proper divisors (2366039782519).

16545126171721 is an equidigital number, since it uses as much as digits as its factorization.

16545126171721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306291183.

The product of its digits is 705600, while the sum is 49.

The spelling of 16545126171721 in words is "sixteen trillion, five hundred forty-five billion, one hundred twenty-six million, one hundred seventy-one thousand, seven hundred twenty-one".