161453209991 has 2 divisors, whose sum is σ = 161453209992. Its totient is φ = 161453209990.

The previous prime is 161453209969. The next prime is 161453210003. The reversal of 161453209991 is 199902354161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161453209991 - 2⁶ = 161453209927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161453209901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80726604995 + 80726604996.

It is an arithmetic number, because the mean of its divisors is an integer number (80726604996).

Almost surely, 2^161453209991 is an apocalyptic number.

161453209991 is a deficient number, since it is larger than the sum of its proper divisors (1).

161453209991 is an equidigital number, since it uses as much as digits as its factorization.

161453209991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 161453209991 in words is "one hundred sixty-one billion, four hundred fifty-three million, two hundred nine thousand, nine hundred ninety-one".