61010005644 has 108 divisors (see below), whose sum is σ = 179460406944. Its totient is φ = 17425412928.

The previous prime is 61010005621. The next prime is 61010005649. The reversal of 61010005644 is 44650001016.

61010005644 is a `hidden beast` number, since 6 + 1 + 0 + 10 + 0 + 0 + 5 + 644 = 666.

It is not an unprimeable number, because it can be changed into a prime (61010005649) 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 35 ways as a sum of consecutive naturals, for example, 8715954 + ... + 8722950.

Almost surely, 2^61010005644 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 61010005644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89730203472).

61010005644 is an abundant number, since it is smaller than the sum of its proper divisors (118450401300).

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

61010005644 is a wasteful number, since it uses less digits than its factorization.

61010005644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11964 (or 11952 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 61010005644 in words is "sixty-one billion, ten million, five thousand, six hundred forty-four".