61605223131056 has 80 divisors (see below), whose sum is σ = 137943511362720. Its totient is φ = 26341221335040.

The previous prime is 61605223131047. The next prime is 61605223131077. The reversal of 61605223131056 is 65013132250616.

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, 201920 + ... + 11101856.

It is an arithmetic number, because the mean of its divisors is an integer number (1724293892034).

Almost surely, 2^{61605223131056} 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 61605223131056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68971755681360).

61605223131056 is an abundant number, since it is smaller than the sum of its proper divisors (76338288231664).

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

61605223131056 is a wasteful number, since it uses less digits than its factorization.

61605223131056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10901862 (or 10901856 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 61605223131056 in words is "sixty-one trillion, six hundred five billion, two hundred twenty-three million, one hundred thirty-one thousand, fifty-six".