9959449599 has 24 divisors (see below), whose sum is σ = 15697718400. Its totient is φ = 6034476240.

The previous prime is 9959449553. The next prime is 9959449637.

9959449599 is a `hidden beast` number, since 9 + 95 + 9 + 449 + 5 + 99 = 666.

9959449599 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9959449599 - 2¹⁹ = 9958925311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9959449519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 460572 + ... + 481710.

It is an arithmetic number, because the mean of its divisors is an integer number (654071600).

Almost surely, 2^9959449599 is an apocalyptic number.

9959449599 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

9959449599 is a deficient number, since it is larger than the sum of its proper divisors (5738268801).

9959449599 is a wasteful number, since it uses less digits than its factorization.

9959449599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25915 (or 25912 counting only the distinct ones).

The product of its digits is 212576400, while the sum is 72.

The square root of 9959449599 is about 99797.0420353229. The cubic root of 9959449599 is about 2151.5186385506.

The spelling of 9959449599 in words is "nine billion, nine hundred fifty-nine million, four hundred forty-nine thousand, five hundred ninety-nine".