6891778267156 has 12 divisors (see below), whose sum is σ = 12064187624692. Its totient is φ = 3444867517248.

The previous prime is 6891778267151. The next prime is 6891778267159. The reversal of 6891778267156 is 6517628771986.

It can be written as a sum of positive squares in 2 ways, for example, as 6623108131600 + 268670135556 = 2573540^2 + 518334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6891778267151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255388905 + ... + 255415888.

Almost surely, 2^{6891778267156} is an apocalyptic number.

It is an amenable number.

6891778267156 is a deficient number, since it is larger than the sum of its proper divisors (5172409357536).

6891778267156 is a wasteful number, since it uses less digits than its factorization.

6891778267156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510808170 (or 510808168 counting only the distinct ones).

The product of its digits is 426746880, while the sum is 73.

The spelling of 6891778267156 in words is "six trillion, eight hundred ninety-one billion, seven hundred seventy-eight million, two hundred sixty-seven thousand, one hundred fifty-six".