61105561056 has 96 divisors (see below), whose sum is σ = 188708395680. Its totient is φ = 19170367488.

The previous prime is 61105561007. The next prime is 61105561081. The reversal of 61105561056 is 65016550116.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 61105561056.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2065431 + ... + 2094806.

It is an arithmetic number, because the mean of its divisors is an integer number (1965712455).

Almost surely, 2^61105561056 is an apocalyptic number.

It is an amenable number.

61105561056 is an abundant number, since it is smaller than the sum of its proper divisors (127602834624).

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

61105561056 is a wasteful number, since it uses less digits than its factorization.

61105561056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160273 (or 4160259 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 61105561056 in words is "sixty-one billion, one hundred five million, five hundred sixty-one thousand, fifty-six".