61123517844 has 48 divisors (see below), whose sum is σ = 143654448000. Its totient is φ = 20227401216.

The previous prime is 61123517839. The next prime is 61123517881. The reversal of 61123517844 is 44871532116.

It is a junction number, because it is equal to n+sod(n) for n = 61123517796 and 61123517805.

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, 1063312 + ... + 1119320.

It is an arithmetic number, because the mean of its divisors is an integer number (2992801000).

Almost surely, 2^61123517844 is an apocalyptic number.

It is an amenable number.

61123517844 is an abundant number, since it is smaller than the sum of its proper divisors (82530930156).

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

61123517844 is a wasteful number, since it uses less digits than its factorization.

61123517844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56672 (or 56670 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The spelling of 61123517844 in words is "sixty-one billion, one hundred twenty-three million, five hundred seventeen thousand, eight hundred forty-four".