61120515568 has 20 divisors (see below), whose sum is σ = 135338284720. Its totient is φ = 26194506624.

The previous prime is 61120515557. The next prime is 61120515587. The reversal of 61120515568 is 86551502116.

It is a self number, because there is not a number n which added to its sum of digits gives 61120515568.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272859333 + ... + 272859556.

It is an arithmetic number, because the mean of its divisors is an integer number (6766914236).

Almost surely, 2^61120515568 is an apocalyptic number.

It is an amenable number.

61120515568 is an abundant number, since it is smaller than the sum of its proper divisors (74217769152).

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

61120515568 is a wasteful number, since it uses less digits than its factorization.

61120515568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545718904 (or 545718898 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 40.

The spelling of 61120515568 in words is "sixty-one billion, one hundred twenty million, five hundred fifteen thousand, five hundred sixty-eight".