161235005137 has 2 divisors, whose sum is σ = 161235005138. Its totient is φ = 161235005136.

The previous prime is 161235005131. The next prime is 161235005171. The reversal of 161235005137 is 731500532161.

It is an a-pointer prime, because the next prime (161235005171) can be obtained adding 161235005137 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111072892176 + 50162112961 = 333276^2 + 223969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161235005137 is a prime.

It is not a weakly prime, because it can be changed into another prime (161235005131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80617502568 + 80617502569.

It is an arithmetic number, because the mean of its divisors is an integer number (80617502569).

Almost surely, 2^161235005137 is an apocalyptic number.

It is an amenable number.

161235005137 is a deficient number, since it is larger than the sum of its proper divisors (1).

161235005137 is an equidigital number, since it uses as much as digits as its factorization.

161235005137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

Adding to 161235005137 its reverse (731500532161), we get a palindrome (892735537298).

The spelling of 161235005137 in words is "one hundred sixty-one billion, two hundred thirty-five million, five thousand, one hundred thirty-seven".