681909070909179 has 4 divisors (see below), whose sum is σ = 909212094545576. Its totient is φ = 454606047272784.

The previous prime is 681909070909147. The next prime is 681909070909181. The reversal of 681909070909179 is 971909070909186.

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

It is not a de Polignac number, because 681909070909179 - 2⁵ = 681909070909147 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 681909070909179.

It is not an unprimeable number, because it can be changed into a prime (681909070909679) 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, 113651511818194 + ... + 113651511818199.

It is an arithmetic number, because the mean of its divisors is an integer number (227303023636394).

Almost surely, 2^{681909070909179} is an apocalyptic number.

681909070909179 is a deficient number, since it is larger than the sum of its proper divisors (227303023636397).

681909070909179 is a wasteful number, since it uses less digits than its factorization.

681909070909179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227303023636396.

The product of its (nonzero) digits is 138883248, while the sum is 75.

The spelling of 681909070909179 in words is "six hundred eighty-one trillion, nine hundred nine billion, seventy million, nine hundred nine thousand, one hundred seventy-nine".