678581091091 has 4 divisors (see below), whose sum is σ = 678606539472. Its totient is φ = 678555642712.

The previous prime is 678581091037. The next prime is 678581091137. The reversal of 678581091091 is 190190185876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678581091091 - 2²⁹ = 678044220179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678581091791) 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, 12684151 + ... + 12737536.

It is an arithmetic number, because the mean of its divisors is an integer number (169651634868).

Almost surely, 2^678581091091 is an apocalyptic number.

678581091091 is a deficient number, since it is larger than the sum of its proper divisors (25448381).

678581091091 is a wasteful number, since it uses less digits than its factorization.

678581091091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25448380.

The product of its (nonzero) digits is 1088640, while the sum is 55.

The spelling of 678581091091 in words is "six hundred seventy-eight billion, five hundred eighty-one million, ninety-one thousand, ninety-one".