9981408650 has 48 divisors (see below), whose sum is σ = 19037417688. Its totient is φ = 3892224000.

The previous prime is 9981408623. The next prime is 9981408667. The reversal of 9981408650 is 568041899.

It is a happy number.

It is a Cunningham number, because it is equal to 99907²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 104427961 + 9876980689 = 10219^2 + 99383^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330170 + ... + 359130.

Almost surely, 2^9981408650 is an apocalyptic number.

9981408650 is a deficient number, since it is larger than the sum of its proper divisors (9056009038).

9981408650 is a wasteful number, since it uses less digits than its factorization.

9981408650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29147 (or 29142 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 9981408650 is about 99907.0000050047. Note that the first 5 decimals coincide. The cubic root of 9981408650 is about 2153.0987334692.

The spelling of 9981408650 in words is "nine billion, nine hundred eighty-one million, four hundred eight thousand, six hundred fifty".