99917910450 has 90 divisors (see below), whose sum is σ = 277679669421. Its totient is φ = 26639411760.

The previous prime is 99917910419. The next prime is 99917910451. The reversal of 99917910450 is 5401971999.

99917910450 is a `hidden beast` number, since 9 + 9 + 9 + 179 + 10 + 450 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 97919552241 + 1998358209 = 312921^2 + 44703^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=223515.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99917910451) by changing a digit.

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 44 ways as a sum of consecutive naturals, for example, 20113867 + ... + 20118833.

Almost surely, 2^99917910450 is an apocalyptic number.

99917910450 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99917910450

99917910450 is an abundant number, since it is smaller than the sum of its proper divisors (177761758971).

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

99917910450 is an frugal number, since it uses more digits than its factorization.

99917910450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9958 (or 4977 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 54.

The spelling of 99917910450 in words is "ninety-nine billion, nine hundred seventeen million, nine hundred ten thousand, four hundred fifty".