61194938816 has 168 divisors, whose sum is σ = 141312808560. Its totient is φ = 26227998720.

The previous prime is 61194938801. The next prime is 61194938821. The reversal of 61194938816 is 61883949116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9653600 + ... + 9659936.

It is an arithmetic number, because the mean of its divisors is an integer number (841147670).

Almost surely, 2^61194938816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61194938816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70656404280).

61194938816 is an abundant number, since it is smaller than the sum of its proper divisors (80117869744).

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

61194938816 is a wasteful number, since it uses less digits than its factorization.

61194938816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443 (or 6422 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 56.

The spelling of 61194938816 in words is "sixty-one billion, one hundred ninety-four million, nine hundred thirty-eight thousand, eight hundred sixteen".