6985781855 has 32 divisors (see below), whose sum is σ = 9282821184. Its totient is φ = 5013328896.

The previous prime is 6985781827. The next prime is 6985781863. The reversal of 6985781855 is 5581875896.

6985781855 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6985781855 - 2²⁸ = 6717346399 is a prime.

It is a super-2 number, since 2×6985781855² = 97602296251294482050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3445352 + ... + 3447378.

It is an arithmetic number, because the mean of its divisors is an integer number (290088162).

Almost surely, 2^6985781855 is an apocalyptic number.

6985781855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6985781855 is a deficient number, since it is larger than the sum of its proper divisors (2297039329).

6985781855 is a wasteful number, since it uses less digits than its factorization.

6985781855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3515.

The product of its digits is 24192000, while the sum is 62.

The square root of 6985781855 is about 83580.9897943306. The cubic root of 6985781855 is about 1911.6351461774.

The spelling of 6985781855 in words is "six billion, nine hundred eighty-five million, seven hundred eighty-one thousand, eight hundred fifty-five".