61016561056 has 48 divisors (see below), whose sum is σ = 134094568608. Its totient is φ = 27089798400.

The previous prime is 61016561051. The next prime is 61016561093. The reversal of 61016561056 is 65016561016.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (61016561051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2000475 + ... + 2030746.

It is an arithmetic number, because the mean of its divisors is an integer number (2793636846).

Almost surely, 2^61016561056 is an apocalyptic number.

It is an amenable number.

61016561056 is an abundant number, since it is smaller than the sum of its proper divisors (73078007552).

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

61016561056 is a wasteful number, since it uses less digits than its factorization.

61016561056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031285 (or 4031277 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 61016561056 in words is "sixty-one billion, sixteen million, five hundred sixty-one thousand, fifty-six".