806807780091 has 32 divisors (see below), whose sum is σ = 1201766707200. Its totient is φ = 534953691360.

The previous prime is 806807780063. The next prime is 806807780137. The reversal of 806807780091 is 190087708608.

It is not a de Polignac number, because 806807780091 - 2⁹ = 806807779579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (806807780491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5786406 + ... + 5924196.

It is an arithmetic number, because the mean of its divisors is an integer number (37555209600).

Almost surely, 2^806807780091 is an apocalyptic number.

806807780091 is a deficient number, since it is larger than the sum of its proper divisors (394958927109).

806807780091 is a wasteful number, since it uses less digits than its factorization.

806807780091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138976 (or 138970 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The spelling of 806807780091 in words is "eight hundred six billion, eight hundred seven million, seven hundred eighty thousand, ninety-one".