61536220241 has 4 divisors (see below), whose sum is σ = 63658158900. Its totient is φ = 59414281584.

The previous prime is 61536220223. The next prime is 61536220279. The reversal of 61536220241 is 14202263516.

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 23433180241 + 38103040000 = 153079^2 + 195200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61536220241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61536220198 and 61536220207.

It is not an unprimeable number, because it can be changed into a prime (61536280241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060969286 + ... + 1060969343.

It is an arithmetic number, because the mean of its divisors is an integer number (15914539725).

Almost surely, 2^61536220241 is an apocalyptic number.

It is an amenable number.

61536220241 is a deficient number, since it is larger than the sum of its proper divisors (2121938659).

61536220241 is a wasteful number, since it uses less digits than its factorization.

61536220241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121938658.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 61536220241 its reverse (14202263516), we get a palindrome (75738483757).

The spelling of 61536220241 in words is "sixty-one billion, five hundred thirty-six million, two hundred twenty thousand, two hundred forty-one".