61661882241 has 6 divisors (see below), whose sum is σ = 89067163250. Its totient is φ = 41107921488.

The previous prime is 61661882213. The next prime is 61661882257. The reversal of 61661882241 is 14228816616.

It is a happy number.

61661882241 is a `hidden beast` number, since 6 + 1 + 6 + 618 + 8 + 2 + 24 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60378809841 + 1283072400 = 245721^2 + 35820^2 .

It is not a de Polignac number, because 61661882241 - 2²⁶ = 61594773377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61661882201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3425660116 + ... + 3425660133.

Almost surely, 2^61661882241 is an apocalyptic number.

It is an amenable number.

61661882241 is a deficient number, since it is larger than the sum of its proper divisors (27405281009).

61661882241 is a wasteful number, since it uses less digits than its factorization.

61661882241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6851320255 (or 6851320252 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The spelling of 61661882241 in words is "sixty-one billion, six hundred sixty-one million, eight hundred eighty-two thousand, two hundred forty-one".