18861439048608 has 384 divisors, whose sum is σ = 58424193112320. Its totient is φ = 5271879352320.

The previous prime is 18861439048589. The next prime is 18861439048609. The reversal of 18861439048608 is 80684093416881.

It is not an unprimeable number, because it can be changed into a prime (18861439048609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3236900991 + ... + 3236906817.

It is an arithmetic number, because the mean of its divisors is an integer number (152146336230).

Almost surely, 2^{18861439048608} 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 18861439048608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29212096556160).

18861439048608 is an abundant number, since it is smaller than the sum of its proper divisors (39562754063712).

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

18861439048608 is a wasteful number, since it uses less digits than its factorization.

18861439048608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11160 (or 11152 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 66.

The spelling of 18861439048608 in words is "eighteen trillion, eight hundred sixty-one billion, four hundred thirty-nine million, forty-eight thousand, six hundred eight".