80491099680 has 240 divisors, whose sum is σ = 284317470360. Its totient is φ = 21445337088.

The previous prime is 80491099657. The next prime is 80491099739. The reversal of 80491099680 is 8699019408.

80491099680 is a `hidden beast` number, since 8 + 0 + 491 + 0 + 99 + 68 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 61470276624 + 19020823056 = 247932^2 + 137916^2 .

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×80491099680² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20695176 + ... + 20699064.

Almost surely, 2^80491099680 is an apocalyptic number.

80491099680 is a gapful number since it is divisible by the number (80) 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 80491099680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142158735180).

80491099680 is an abundant number, since it is smaller than the sum of its proper divisors (203826370680).

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

80491099680 is a wasteful number, since it uses less digits than its factorization.

80491099680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513 (or 5496 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 80491099680 in words is "eighty billion, four hundred ninety-one million, ninety-nine thousand, six hundred eighty".