16545122612581 has 2 divisors, whose sum is σ = 16545122612582. Its totient is φ = 16545122612580.

The previous prime is 16545122612519. The next prime is 16545122612609. The reversal of 16545122612581 is 18521622154561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14521175363556 + 2023947249025 = 3810666^2 + 1422655^2 .

It is a cyclic number.

It is not a de Polignac number, because 16545122612581 - 2¹³ = 16545122604389 is a prime.

It is a super-2 number, since 2×16545122612581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16545122612881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8272561306290 + 8272561306291.

It is an arithmetic number, because the mean of its divisors is an integer number (8272561306291).

Almost surely, 2^{16545122612581} is an apocalyptic number.

It is an amenable number.

16545122612581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16545122612581 is an equidigital number, since it uses as much as digits as its factorization.

16545122612581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152000, while the sum is 49.

The spelling of 16545122612581 in words is "sixteen trillion, five hundred forty-five billion, one hundred twenty-two million, six hundred twelve thousand, five hundred eighty-one".