680835804181 has 4 divisors (see below), whose sum is σ = 733207789132. Its totient is φ = 628463819232.

The previous prime is 680835804101. The next prime is 680835804191. The reversal of 680835804181 is 181408538086.

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

It can be written as a sum of positive squares in 2 ways, for example, as 175385901681 + 505449902500 = 418791^2 + 710950^2 .

It is a cyclic number.

It is not a de Polignac number, because 680835804181 - 2⁷ = 680835804053 is a prime.

It is a super-2 number, since 2×680835804181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680835804101) 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, 26185992456 + ... + 26185992481.

It is an arithmetic number, because the mean of its divisors is an integer number (183301947283).

Almost surely, 2^680835804181 is an apocalyptic number.

It is an amenable number.

680835804181 is a deficient number, since it is larger than the sum of its proper divisors (52371984951).

680835804181 is a wasteful number, since it uses less digits than its factorization.

680835804181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52371984950.

The product of its (nonzero) digits is 1474560, while the sum is 52.

The spelling of 680835804181 in words is "six hundred eighty billion, eight hundred thirty-five million, eight hundred four thousand, one hundred eighty-one".