16545720474697 has 2 divisors, whose sum is σ = 16545720474698. Its totient is φ = 16545720474696.

The previous prime is 16545720474671. The next prime is 16545720474727. The reversal of 16545720474697 is 79647402754561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8748468443961 + 7797252030736 = 2957781^2 + 2792356^2 .

It is an emirp because it is prime and its reverse (79647402754561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16545720474697 - 2²³ = 16545712086089 is a prime.

It is not a weakly prime, because it can be changed into another prime (16545720474667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8272860237348 + 8272860237349.

It is an arithmetic number, because the mean of its divisors is an integer number (8272860237349).

Almost surely, 2^{16545720474697} is an apocalyptic number.

It is an amenable number.

16545720474697 is a deficient number, since it is larger than the sum of its proper divisors (1).

16545720474697 is an equidigital number, since it uses as much as digits as its factorization.

16545720474697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 355622400, while the sum is 67.

The spelling of 16545720474697 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, four hundred seventy-four thousand, six hundred ninety-seven".