16144165561 has 2 divisors, whose sum is σ = 16144165562. Its totient is φ = 16144165560.

The previous prime is 16144165559. The next prime is 16144165571. The reversal of 16144165561 is 16556144161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10227479161 + 5916686400 = 101131^2 + 76920^2 .

It is a cyclic number.

It is not a de Polignac number, because 16144165561 - 2¹ = 16144165559 is a prime.

Together with 16144165559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16144165571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8072082780 + 8072082781.

It is an arithmetic number, because the mean of its divisors is an integer number (8072082781).

Almost surely, 2^16144165561 is an apocalyptic number.

It is an amenable number.

16144165561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16144165561 is an equidigital number, since it uses as much as digits as its factorization.

16144165561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 40.

The spelling of 16144165561 in words is "sixteen billion, one hundred forty-four million, one hundred sixty-five thousand, five hundred sixty-one".