161335565235253 has 2 divisors, whose sum is σ = 161335565235254. Its totient is φ = 161335565235252.

The previous prime is 161335565235197. The next prime is 161335565235349. The reversal of 161335565235253 is 352532565533161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97330813147044 + 64004752088209 = 9865638^2 + 8000297^2 .

It is a cyclic number.

It is not a de Polignac number, because 161335565235253 - 2¹³ = 161335565227061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161335565235194 and 161335565235203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161335565233253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80667782617626 + 80667782617627.

It is an arithmetic number, because the mean of its divisors is an integer number (80667782617627).

Almost surely, 2^{161335565235253} is an apocalyptic number.

It is an amenable number.

161335565235253 is a deficient number, since it is larger than the sum of its proper divisors (1).

161335565235253 is an equidigital number, since it uses as much as digits as its factorization.

161335565235253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36450000, while the sum is 55.

The spelling of 161335565235253 in words is "one hundred sixty-one trillion, three hundred thirty-five billion, five hundred sixty-five million, two hundred thirty-five thousand, two hundred fifty-three".