61663360256244 has 18 divisors (see below), whose sum is σ = 155871271758930. Its totient is φ = 20554453418736.

The previous prime is 61663360256219. The next prime is 61663360256263. The reversal of 61663360256244 is 44265206336616.

61663360256244 is a `hidden beast` number, since 6 + 1 + 6 + 6 + 3 + 3 + 6 + 0 + 2 + 5 + 624 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55108797660900 + 6554562595344 = 7423530^2 + 2560188^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 856435559079 + ... + 856435559150.

Almost surely, 2^{61663360256244} is an apocalyptic number.

It is an amenable number.

61663360256244 is an abundant number, since it is smaller than the sum of its proper divisors (94207911502686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61663360256244 is a wasteful number, since it uses less digits than its factorization.

61663360256244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712871118239 (or 1712871118234 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 54.

The spelling of 61663360256244 in words is "sixty-one trillion, six hundred sixty-three billion, three hundred sixty million, two hundred fifty-six thousand, two hundred forty-four".