6786921455 has 16 divisors (see below), whose sum is σ = 8192448000. Its totient is φ = 5397531168.

The previous prime is 6786921451. The next prime is 6786921457. The reversal of 6786921455 is 5541296876.

It is a cyclic number.

It is not a de Polignac number, because 6786921455 - 2² = 6786921451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6786921397 and 6786921406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6786921451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 651014 + ... + 661356.

It is an arithmetic number, because the mean of its divisors is an integer number (512028000).

Almost surely, 2^6786921455 is an apocalyptic number.

6786921455 is a deficient number, since it is larger than the sum of its proper divisors (1405526545).

6786921455 is a wasteful number, since it uses less digits than its factorization.

6786921455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11110.

The product of its digits is 3628800, while the sum is 53.

The square root of 6786921455 is about 82382.7740186017. The cubic root of 6786921455 is about 1893.3210977693.

The spelling of 6786921455 in words is "six billion, seven hundred eighty-six million, nine hundred twenty-one thousand, four hundred fifty-five".