99581876640 has 144 divisors (see below), whose sum is σ = 340214952168. Its totient is φ = 26524551168.

The previous prime is 99581876629. The next prime is 99581876663. The reversal of 99581876640 is 4667818599.

99581876640 is a `hidden beast` number, since 9 + 9 + 581 + 8 + 7 + 6 + 6 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 71103289104 + 28478587536 = 266652^2 + 168756^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

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 23 ways as a sum of consecutive naturals, for example, 1223454 + ... + 1302306.

Almost surely, 2^99581876640 is an apocalyptic number.

99581876640 is a gapful number since it is divisible by the number (90) 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 99581876640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170107476084).

99581876640 is an abundant number, since it is smaller than the sum of its proper divisors (240633075528).

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

99581876640 is a wasteful number, since it uses less digits than its factorization.

99581876640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79751 (or 79740 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 99581876640 in words is "ninety-nine billion, five hundred eighty-one million, eight hundred seventy-six thousand, six hundred forty".