161921158703 has 2 divisors, whose sum is σ = 161921158704. Its totient is φ = 161921158702.

The previous prime is 161921158691. The next prime is 161921158727. The reversal of 161921158703 is 307851129161.

161921158703 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (307851129161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161921158703 - 2⁸ = 161921158447 is a prime.

It is a super-2 number, since 2×161921158703² (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 (161921158793) 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, 80960579351 + 80960579352.

It is an arithmetic number, because the mean of its divisors is an integer number (80960579352).

Almost surely, 2^161921158703 is an apocalyptic number.

161921158703 is a deficient number, since it is larger than the sum of its proper divisors (1).

161921158703 is an equidigital number, since it uses as much as digits as its factorization.

161921158703 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 44.

The spelling of 161921158703 in words is "one hundred sixty-one billion, nine hundred twenty-one million, one hundred fifty-eight thousand, seven hundred three".