6855590091 has 16 divisors (see below), whose sum is σ = 10453280000. Its totient is φ = 3914980128.

The previous prime is 6855590087. The next prime is 6855590101. The reversal of 6855590091 is 1900955586.

It is a happy number.

It is not a de Polignac number, because 6855590091 - 2² = 6855590087 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 6855590091.

It is not an unprimeable number, because it can be changed into a prime (6855590041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70216 + ... + 136533.

It is an arithmetic number, because the mean of its divisors is an integer number (653330000).

Almost surely, 2^6855590091 is an apocalyptic number.

6855590091 is a deficient number, since it is larger than the sum of its proper divisors (3597689909).

6855590091 is a wasteful number, since it uses less digits than its factorization.

6855590091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208338.

The product of its (nonzero) digits is 486000, while the sum is 48.

The square root of 6855590091 is about 82798.4908739284. The cubic root of 6855590091 is about 1899.6850900990.

The spelling of 6855590091 in words is "six billion, eight hundred fifty-five million, five hundred ninety thousand, ninety-one".