61844550872 has 96 divisors (see below), whose sum is σ = 129935738880. Its totient is φ = 27554567040.

The previous prime is 61844550871. The next prime is 61844550931. The reversal of 61844550872 is 27805544816.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61844550872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61844550871) 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 23 ways as a sum of consecutive naturals, for example, 19403663 + ... + 19406849.

It is an arithmetic number, because the mean of its divisors is an integer number (1353497280).

Almost surely, 2^61844550872 is an apocalyptic number.

61844550872 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61844550872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64967869440).

61844550872 is an abundant number, since it is smaller than the sum of its proper divisors (68091188008).

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

61844550872 is a wasteful number, since it uses less digits than its factorization.

61844550872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3713 (or 3696 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 61844550872 in words is "sixty-one billion, eight hundred forty-four million, five hundred fifty thousand, eight hundred seventy-two".