16758543172081 has 2 divisors, whose sum is σ = 16758543172082. Its totient is φ = 16758543172080.

The previous prime is 16758543172079. The next prime is 16758543172153. The reversal of 16758543172081 is 18027134585761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12090113143056 + 4668430029025 = 3477084^2 + 2160655^2 .

It is a cyclic number.

It is not a de Polignac number, because 16758543172081 - 2¹ = 16758543172079 is a prime.

It is a super-2 number, since 2×16758543172081² (a number of 27 digits) contains 22 as substring.

Together with 16758543172079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16758543172061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8379271586040 + 8379271586041.

It is an arithmetic number, because the mean of its divisors is an integer number (8379271586041).

Almost surely, 2^{16758543172081} is an apocalyptic number.

It is an amenable number.

16758543172081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16758543172081 is an equidigital number, since it uses as much as digits as its factorization.

16758543172081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11289600, while the sum is 58.

The spelling of 16758543172081 in words is "sixteen trillion, seven hundred fifty-eight billion, five hundred forty-three million, one hundred seventy-two thousand, eighty-one".