499998981471648 has 96 divisors (see below), whose sum is σ = 1319014189785600. Its totient is φ = 165839504633856.

The previous prime is 499998981471637. The next prime is 499998981471659. The reversal of 499998981471648 is 846174189899994.

It is a Cunningham number, because it is equal to 22360657²-1.

It is an interprime number because it is at equal distance from previous prime (499998981471637) and next prime (499998981471659).

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

It is a Harshad number since it is a multiple of its sum of digits (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39131148 + ... + 50311476.

It is an arithmetic number, because the mean of its divisors is an integer number (13739731143600).

Almost surely, 2^{499998981471648} is an apocalyptic number.

499998981471648 is a gapful number since it is divisible by the number (48) 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 499998981471648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659507094892800).

499998981471648 is an abundant number, since it is smaller than the sum of its proper divisors (819015208313952).

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

499998981471648 is a wasteful number, since it uses less digits than its factorization.

499998981471648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11182654 (or 11182646 counting only the distinct ones).

The product of its digits is 81266540544, while the sum is 96.

The spelling of 499998981471648 in words is "four hundred ninety-nine trillion, nine hundred ninety-eight billion, nine hundred eighty-one million, four hundred seventy-one thousand, six hundred forty-eight".