161123519662541 has 2 divisors, whose sum is σ = 161123519662542. Its totient is φ = 161123519662540.

The previous prime is 161123519662477. The next prime is 161123519662601. The reversal of 161123519662541 is 145266915321161.

161123519662541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107441081813641 + 53682437848900 = 10365379^2 + 7326830^2 .

It is a cyclic number.

It is not a de Polignac number, because 161123519662541 - 2⁶ = 161123519662477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161123519662841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80561759831270 + 80561759831271.

It is an arithmetic number, because the mean of its divisors is an integer number (80561759831271).

Almost surely, 2^{161123519662541} is an apocalyptic number.

It is an amenable number.

161123519662541 is a deficient number, since it is larger than the sum of its proper divisors (1).

161123519662541 is an equidigital number, since it uses as much as digits as its factorization.

161123519662541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 53.

The spelling of 161123519662541 in words is "one hundred sixty-one trillion, one hundred twenty-three billion, five hundred nineteen million, six hundred sixty-two thousand, five hundred forty-one".