61331486844 has 48 divisors (see below), whose sum is σ = 147598811136. Its totient is φ = 19810728000.

The previous prime is 61331486813. The next prime is 61331486899. The reversal of 61331486844 is 44868413316.

61331486844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61331486793 and 61331486802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481372 + ... + 595299.

It is an arithmetic number, because the mean of its divisors is an integer number (3074975232).

Almost surely, 2^61331486844 is an apocalyptic number.

It is an amenable number.

61331486844 is an abundant number, since it is smaller than the sum of its proper divisors (86267324292).

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

61331486844 is a wasteful number, since it uses less digits than its factorization.

61331486844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076826 (or 1076824 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 48.

The spelling of 61331486844 in words is "sixty-one billion, three hundred thirty-one million, four hundred eighty-six thousand, eight hundred forty-four".