9855971693 has 2 divisors, whose sum is σ = 9855971694. Its totient is φ = 9855971692.

The previous prime is 9855971687. The next prime is 9855971711. The reversal of 9855971693 is 3961795589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5476444009 + 4379527684 = 74003^2 + 66178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9855971693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9855971603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927985846 + 4927985847.

It is an arithmetic number, because the mean of its divisors is an integer number (4927985847).

Almost surely, 2^9855971693 is an apocalyptic number.

It is an amenable number.

9855971693 is a deficient number, since it is larger than the sum of its proper divisors (1).

9855971693 is an equidigital number, since it uses as much as digits as its factorization.

9855971693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18370800, while the sum is 62.

The square root of 9855971693 is about 99277.2466026330. The cubic root of 9855971693 is about 2144.0413117788.

The spelling of 9855971693 in words is "nine billion, eight hundred fifty-five million, nine hundred seventy-one thousand, six hundred ninety-three".