161453210081 has 2 divisors, whose sum is σ = 161453210082. Its totient is φ = 161453210080.

The previous prime is 161453210069. The next prime is 161453210119. The reversal of 161453210081 is 180012354161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159424518400 + 2028691681 = 399280^2 + 45041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161453210081 is a prime.

It is a super-2 number, since 2×161453210081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161453210021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80726605040 + 80726605041.

It is an arithmetic number, because the mean of its divisors is an integer number (80726605041).

Almost surely, 2^161453210081 is an apocalyptic number.

It is an amenable number.

161453210081 is a deficient number, since it is larger than the sum of its proper divisors (1).

161453210081 is an equidigital number, since it uses as much as digits as its factorization.

161453210081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 161453210081 in words is "one hundred sixty-one billion, four hundred fifty-three million, two hundred ten thousand, eighty-one".