123320520234161 has 2 divisors, whose sum is σ = 123320520234162. Its totient is φ = 123320520234160.

The previous prime is 123320520234077. The next prime is 123320520234193. The reversal of 123320520234161 is 161432025023321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119357394856561 + 3963125377600 = 10925081^2 + 1990760^2 .

It is a cyclic number.

It is not a de Polignac number, because 123320520234161 - 2²² = 123320516039857 is a prime.

It is a super-2 number, since 2×123320520234161² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123320520234361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61660260117080 + 61660260117081.

It is an arithmetic number, because the mean of its divisors is an integer number (61660260117081).

Almost surely, 2^{123320520234161} is an apocalyptic number.

It is an amenable number.

123320520234161 is a deficient number, since it is larger than the sum of its proper divisors (1).

123320520234161 is an equidigital number, since it uses as much as digits as its factorization.

123320520234161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 123320520234161 its reverse (161432025023321), we get a palindrome (284752545257482).

The spelling of 123320520234161 in words is "one hundred twenty-three trillion, three hundred twenty billion, five hundred twenty million, two hundred thirty-four thousand, one hundred sixty-one".