9959621225 has 12 divisors (see below), whose sum is σ = 12361161216. Its totient is φ = 7960451280.

The previous prime is 9959621197. The next prime is 9959621279. The reversal of 9959621225 is 5221269599.

It is a de Polignac number, because none of the positive numbers 2^k-9959621225 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153017 + ... + 208166.

It is an arithmetic number, because the mean of its divisors is an integer number (1030096768).

Almost surely, 2^9959621225 is an apocalyptic number.

It is an amenable number.

9959621225 is a deficient number, since it is larger than the sum of its proper divisors (2401539991).

9959621225 is a wasteful number, since it uses less digits than its factorization.

9959621225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362296 (or 362291 counting only the distinct ones).

The product of its digits is 874800, while the sum is 50.

The square root of 9959621225 is about 99797.9019068036. The cubic root of 9959621225 is about 2151.5309971458.

The spelling of 9959621225 in words is "nine billion, nine hundred fifty-nine million, six hundred twenty-one thousand, two hundred twenty-five".