9771820855 has 4 divisors (see below), whose sum is σ = 11726185032. Its totient is φ = 7817456680.

The previous prime is 9771820811. The next prime is 9771820867. The reversal of 9771820855 is 5580281779.

It is a happy number.

9771820855 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 semiprime because it is the product of two primes.

It is not a de Polignac number, because 9771820855 - 2¹⁷ = 9771689783 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 977182081 + ... + 977182090.

It is an arithmetic number, because the mean of its divisors is an integer number (2931546258).

Almost surely, 2^9771820855 is an apocalyptic number.

9771820855 is a deficient number, since it is larger than the sum of its proper divisors (1954364177).

9771820855 is a wasteful number, since it uses less digits than its factorization.

9771820855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954364176.

The product of its (nonzero) digits is 1411200, while the sum is 52.

The square root of 9771820855 is about 98852.5207316435. The cubic root of 9771820855 is about 2137.9218810013.

The spelling of 9771820855 in words is "nine billion, seven hundred seventy-one million, eight hundred twenty thousand, eight hundred fifty-five".