161290542778613 has 2 divisors, whose sum is σ = 161290542778614. Its totient is φ = 161290542778612.

The previous prime is 161290542778531. The next prime is 161290542778637. The reversal of 161290542778613 is 316877245092161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138793421847844 + 22497120930769 = 11781062^2 + 4743113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161290542778613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161290542778913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80645271389306 + 80645271389307.

It is an arithmetic number, because the mean of its divisors is an integer number (80645271389307).

It is a 1-persistent number, because it is pandigital, but 2⋅161290542778613 = 322581085557226 is not.

Almost surely, 2^{161290542778613} is an apocalyptic number.

It is an amenable number.

161290542778613 is a deficient number, since it is larger than the sum of its proper divisors (1).

161290542778613 is an equidigital number, since it uses as much as digits as its factorization.

161290542778613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30481920, while the sum is 62.

The spelling of 161290542778613 in words is "one hundred sixty-one trillion, two hundred ninety billion, five hundred forty-two million, seven hundred seventy-eight thousand, six hundred thirteen".