9901656785 has 8 divisors (see below), whose sum is σ = 11944198656. Its totient is φ = 7879851760.

The previous prime is 9901656763. The next prime is 9901656829. The reversal of 9901656785 is 5876561099.

9901656785 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9901656785 - 2⁸ = 9901656529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9901656785.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5183159 + ... + 5185068.

It is an arithmetic number, because the mean of its divisors is an integer number (1493024832).

Almost surely, 2^9901656785 is an apocalyptic number.

It is an amenable number.

9901656785 is a deficient number, since it is larger than the sum of its proper divisors (2042541871).

9901656785 is a wasteful number, since it uses less digits than its factorization.

9901656785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10368423.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The square root of 9901656785 is about 99507.0690202460. The cubic root of 9901656785 is about 2147.3489433841.

The spelling of 9901656785 in words is "nine billion, nine hundred one million, six hundred fifty-six thousand, seven hundred eighty-five".