9778836655 has 12 divisors (see below), whose sum is σ = 13650458040. Its totient is φ = 6705487824.

The previous prime is 9778836643. The next prime is 9778836659. The reversal of 9778836655 is 5566388779.

It is not a de Polignac number, because 9778836655 - 2⁵ = 9778836623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9778836659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19956565 + ... + 19957054.

It is an arithmetic number, because the mean of its divisors is an integer number (1137538170).

Almost surely, 2^9778836655 is an apocalyptic number.

9778836655 is a deficient number, since it is larger than the sum of its proper divisors (3871621385).

9778836655 is a wasteful number, since it uses less digits than its factorization.

9778836655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39913638 (or 39913631 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 64.

The square root of 9778836655 is about 98888.0005612410. Note that the first 3 decimals coincide. The cubic root of 9778836655 is about 2138.4334077801.

The spelling of 9778836655 in words is "nine billion, seven hundred seventy-eight million, eight hundred thirty-six thousand, six hundred fifty-five".