61143668443856 has 10 divisors (see below), whose sum is σ = 118465857610002. Its totient is φ = 30571834221920.

The previous prime is 61143668443853. The next prime is 61143668443861. The reversal of 61143668443856 is 65834486634116.

It is a happy number.

61143668443856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 60380421594256 + 763246849600 = 7770484^2 + 873640^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61143668443792 and 61143668443801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61143668443853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910739638855 + ... + 1910739638886.

Almost surely, 2^{61143668443856} is an apocalyptic number.

It is an amenable number.

61143668443856 is a deficient number, since it is larger than the sum of its proper divisors (57322189166146).

61143668443856 is a wasteful number, since it uses less digits than its factorization.

61143668443856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821479277749 (or 3821479277743 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 65.

The spelling of 61143668443856 in words is "sixty-one trillion, one hundred forty-three billion, six hundred sixty-eight million, four hundred forty-three thousand, eight hundred fifty-six".