9778905855 has 12 divisors (see below), whose sum is σ = 16950103560. Its totient is φ = 5215416432.

The previous prime is 9778905847. The next prime is 9778905881. The reversal of 9778905855 is 5585098779.

It is not a de Polignac number, because 9778905855 - 2³ = 9778905847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9778905792 and 9778905801.

It is a congruent 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, 108654465 + ... + 108654554.

It is an arithmetic number, because the mean of its divisors is an integer number (1412508630).

Almost surely, 2^9778905855 is an apocalyptic number.

9778905855 is a deficient number, since it is larger than the sum of its proper divisors (7171197705).

9778905855 is a wasteful number, since it uses less digits than its factorization.

9778905855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217309030 (or 217309027 counting only the distinct ones).

The product of its (nonzero) digits is 31752000, while the sum is 63.

The square root of 9778905855 is about 98888.3504514055. The cubic root of 9778905855 is about 2138.4384519807.

The spelling of 9778905855 in words is "nine billion, seven hundred seventy-eight million, nine hundred five thousand, eight hundred fifty-five".