6780856855 has 4 divisors (see below), whose sum is σ = 8137028232. Its totient is φ = 5424685480.

The previous prime is 6780856801. The next prime is 6780856909. The reversal of 6780856855 is 5586580876.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6780856801) and next prime (6780856909).

It is not a de Polignac number, because 6780856855 - 2¹³ = 6780848663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6780856855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678085681 + ... + 678085690.

It is an arithmetic number, because the mean of its divisors is an integer number (2034257058).

Almost surely, 2^6780856855 is an apocalyptic number.

6780856855 is a deficient number, since it is larger than the sum of its proper divisors (1356171377).

6780856855 is a wasteful number, since it uses less digits than its factorization.

6780856855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356171376.

The product of its (nonzero) digits is 16128000, while the sum is 58.

The square root of 6780856855 is about 82345.9583404067. The cubic root of 6780856855 is about 1892.7569904161.

The spelling of 6780856855 in words is "six billion, seven hundred eighty million, eight hundred fifty-six thousand, eight hundred fifty-five".