61005722120 has 192 divisors, whose sum is σ = 170912332800. Its totient is φ = 19175201280.

The previous prime is 61005722119. The next prime is 61005722161. The reversal of 61005722120 is 2122750016.

It is a self number, because there is not a number n which added to its sum of digits gives 61005722120.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3123746 + ... + 3143214.

It is an arithmetic number, because the mean of its divisors is an integer number (890168400).

Almost surely, 2^61005722120 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 61005722120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85456166400).

61005722120 is an abundant number, since it is smaller than the sum of its proper divisors (109906610680).

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

61005722120 is a wasteful number, since it uses less digits than its factorization.

61005722120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19556 (or 19533 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The spelling of 61005722120 in words is "sixty-one billion, five million, seven hundred twenty-two thousand, one hundred twenty".