99945561500 has 96 divisors (see below), whose sum is σ = 219785092800. Its totient is φ = 39703737600.

The previous prime is 99945561497. The next prime is 99945561559. The reversal of 99945561500 is 516554999.

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 31 ways as a sum of consecutive naturals, for example, 59882666 + ... + 59884334.

It is an arithmetic number, because the mean of its divisors is an integer number (2289428050).

Almost surely, 2^99945561500 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 99945561500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109892546400).

99945561500 is an abundant number, since it is smaller than the sum of its proper divisors (119839531300).

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

99945561500 is a wasteful number, since it uses less digits than its factorization.

99945561500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 2428 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 53.

The spelling of 99945561500 in words is "ninety-nine billion, nine hundred forty-five million, five hundred sixty-one thousand, five hundred".