61543783636 has 24 divisors (see below), whose sum is σ = 108768000096. Its totient is φ = 30467529120.

The previous prime is 61543783619. The next prime is 61543783667. The reversal of 61543783636 is 63638734516.

61543783636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 757875 + ... + 835141.

It is an arithmetic number, because the mean of its divisors is an integer number (4532000004).

Almost surely, 2^61543783636 is an apocalyptic number.

It is an amenable number.

61543783636 is a deficient number, since it is larger than the sum of its proper divisors (47224216460).

61543783636 is a wasteful number, since it uses less digits than its factorization.

61543783636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79239 (or 79237 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 52.

The spelling of 61543783636 in words is "sixty-one billion, five hundred forty-three million, seven hundred eighty-three thousand, six hundred thirty-six".