161235340501 has 2 divisors, whose sum is σ = 161235340502. Its totient is φ = 161235340500.

The previous prime is 161235340477. The next prime is 161235340529. The reversal of 161235340501 is 105043532161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153644400625 + 7590939876 = 391975^2 + 87126^2 .

It is a cyclic number.

It is not a de Polignac number, because 161235340501 - 2⁷ = 161235340373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161235346501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80617670250 + 80617670251.

It is an arithmetic number, because the mean of its divisors is an integer number (80617670251).

Almost surely, 2^161235340501 is an apocalyptic number.

It is an amenable number.

161235340501 is a deficient number, since it is larger than the sum of its proper divisors (1).

161235340501 is an equidigital number, since it uses as much as digits as its factorization.

161235340501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 161235340501 its reverse (105043532161), we get a palindrome (266278872662).

The spelling of 161235340501 in words is "one hundred sixty-one billion, two hundred thirty-five million, three hundred forty thousand, five hundred one".