990501865080 has 512 divisors, whose sum is σ = 3683841638400. Its totient is φ = 207471642624.

The previous prime is 990501865061. The next prime is 990501865091. The reversal of 990501865080 is 80568105099.

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 127 ways as a sum of consecutive naturals, for example, 1203525549 + ... + 1203526371.

It is an arithmetic number, because the mean of its divisors is an integer number (7195003200).

Almost surely, 2^990501865080 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 990501865080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1841920819200).

990501865080 is an abundant number, since it is smaller than the sum of its proper divisors (2693339773320).

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

990501865080 is a wasteful number, since it uses less digits than its factorization.

990501865080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 51.

It can be divided in two parts, 990501 and 865080, that added together give a palindrome (1855581).

The spelling of 990501865080 in words is "nine hundred ninety billion, five hundred one million, eight hundred sixty-five thousand, eighty".