61423232161 has 4 divisors (see below), whose sum is σ = 61493270932. Its totient is φ = 61353193392.

The previous prime is 61423232159. The next prime is 61423232179. The reversal of 61423232161 is 16123232416.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52063830625 + 9359401536 = 228175^2 + 96744^2 .

It is a cyclic number.

It is not a de Polignac number, because 61423232161 - 2¹ = 61423232159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61423232111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35018070 + ... + 35019823.

It is an arithmetic number, because the mean of its divisors is an integer number (15373317733).

Almost surely, 2^61423232161 is an apocalyptic number.

It is an amenable number.

61423232161 is a deficient number, since it is larger than the sum of its proper divisors (70038771).

61423232161 is an equidigital number, since it uses as much as digits as its factorization.

61423232161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70038770.

The product of its digits is 10368, while the sum is 31.

Adding to 61423232161 its reverse (16123232416), we get a palindrome (77546464577).

The spelling of 61423232161 in words is "sixty-one billion, four hundred twenty-three million, two hundred thirty-two thousand, one hundred sixty-one".