16717156273121 has 4 divisors (see below), whose sum is σ = 17700518406852. Its totient is φ = 15733794139392.

The previous prime is 16717156273099. The next prime is 16717156273229. The reversal of 16717156273121 is 12137265171761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15319701293521 + 1397454979600 = 3914039^2 + 1182140^2 .

It is a cyclic number.

It is not a de Polignac number, because 16717156273121 - 2¹⁸ = 16717156010977 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 16717156273121.

It is not an unprimeable number, because it can be changed into a prime (16717156270121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491681066840 + ... + 491681066873.

It is an arithmetic number, because the mean of its divisors is an integer number (4425129601713).

Almost surely, 2^{16717156273121} is an apocalyptic number.

It is an amenable number.

16717156273121 is a deficient number, since it is larger than the sum of its proper divisors (983362133731).

16717156273121 is an equidigital number, since it uses as much as digits as its factorization.

16717156273121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983362133730.

The product of its digits is 740880, while the sum is 50.

The spelling of 16717156273121 in words is "sixteen trillion, seven hundred seventeen billion, one hundred fifty-six million, two hundred seventy-three thousand, one hundred twenty-one".