161418500381 has 2 divisors, whose sum is σ = 161418500382. Its totient is φ = 161418500380.

The previous prime is 161418500329. The next prime is 161418500389. The reversal of 161418500381 is 183005814161.

161418500381 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., 161329952281 + 88548100 = 401659^2 + 9410^2 .

It is an emirp because it is prime and its reverse (183005814161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161418500381 is a prime.

It is a super-2 number, since 2×161418500381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161418500389) 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, 80709250190 + 80709250191.

It is an arithmetic number, because the mean of its divisors is an integer number (80709250191).

Almost surely, 2^161418500381 is an apocalyptic number.

It is an amenable number.

161418500381 is a deficient number, since it is larger than the sum of its proper divisors (1).

161418500381 is an equidigital number, since it uses as much as digits as its factorization.

161418500381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 161418500381 in words is "one hundred sixty-one billion, four hundred eighteen million, five hundred thousand, three hundred eighty-one".