9805505997 has 32 divisors (see below), whose sum is σ = 15734476800. Its totient is φ = 5306102208.

The previous prime is 9805505993. The next prime is 9805505999. The reversal of 9805505997 is 7995055089.

It is not a de Polignac number, because 9805505997 - 2² = 9805505993 is a prime.

It is a super-2 number, since 2×9805505997² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9805505993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1943404 + ... + 1948442.

It is an arithmetic number, because the mean of its divisors is an integer number (491702400).

Almost surely, 2^9805505997 is an apocalyptic number.

It is an amenable number.

9805505997 is a deficient number, since it is larger than the sum of its proper divisors (5928970803).

9805505997 is a wasteful number, since it uses less digits than its factorization.

9805505997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9945.

The product of its (nonzero) digits is 5103000, while the sum is 57.

The square root of 9805505997 is about 99022.7549455174. The cubic root of 9805505997 is about 2140.3756580606.

The spelling of 9805505997 in words is "nine billion, eight hundred five million, five hundred five thousand, nine hundred ninety-seven".