6781011655 has 16 divisors (see below), whose sum is σ = 8897493024. Its totient is φ = 4920238080.

The previous prime is 6781011619. The next prime is 6781011661. The reversal of 6781011655 is 5561101876.

6781011655 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6781011655 - 2⁹ = 6781011143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118554 + ... + 166183.

It is an arithmetic number, because the mean of its divisors is an integer number (556093314).

Almost surely, 2^6781011655 is an apocalyptic number.

6781011655 is a deficient number, since it is larger than the sum of its proper divisors (2116481369).

6781011655 is a wasteful number, since it uses less digits than its factorization.

6781011655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285186.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 6781011655 is about 82346.8982718839. The cubic root of 6781011655 is about 1892.7713935394.

The spelling of 6781011655 in words is "six billion, seven hundred eighty-one million, eleven thousand, six hundred fifty-five".