161235534253 has 2 divisors, whose sum is σ = 161235534254. Its totient is φ = 161235534252.

The previous prime is 161235534227. The next prime is 161235534289. The reversal of 161235534253 is 352435532161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151027058884 + 10208475369 = 388622^2 + 101037^2 .

It is a cyclic number.

It is not a de Polignac number, because 161235534253 - 2⁵ = 161235534221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161235534293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80617767126 + 80617767127.

It is an arithmetic number, because the mean of its divisors is an integer number (80617767127).

Almost surely, 2^161235534253 is an apocalyptic number.

It is an amenable number.

161235534253 is a deficient number, since it is larger than the sum of its proper divisors (1).

161235534253 is an equidigital number, since it uses as much as digits as its factorization.

161235534253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 40.

The spelling of 161235534253 in words is "one hundred sixty-one billion, two hundred thirty-five million, five hundred thirty-four thousand, two hundred fifty-three".