61205363856 has 400 divisors, whose sum is σ = 225072483328. Its totient is φ = 15620428800.

The previous prime is 61205363837. The next prime is 61205363899. The reversal of 61205363856 is 65836350216.

61205363856 is a `hidden beast` number, since 6 + 1 + 2 + 0 + 5 + 3 + 638 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3647646 + ... + 3664386.

Almost surely, 2^61205363856 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 61205363856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112536241664).

61205363856 is an abundant number, since it is smaller than the sum of its proper divisors (163867119472).

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

61205363856 is a wasteful number, since it uses less digits than its factorization.

61205363856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16812 (or 16797 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 61205363856 in words is "sixty-one billion, two hundred five million, three hundred sixty-three thousand, eight hundred fifty-six".