681101272234813 has 4 divisors (see below), whose sum is σ = 681244631800128. Its totient is φ = 680957912669500.

The previous prime is 681101272234771. The next prime is 681101272234847. The reversal of 681101272234813 is 318432272101186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681101272234813 - 2⁴⁹ = 118151318813501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681101272234853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71679775531 + ... + 71679785032.

It is an arithmetic number, because the mean of its divisors is an integer number (170311157950032).

Almost surely, 2^{681101272234813} is an apocalyptic number.

It is an amenable number.

681101272234813 is a deficient number, since it is larger than the sum of its proper divisors (143359565315).

681101272234813 is a wasteful number, since it uses less digits than its factorization.

681101272234813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143359565314.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 681101272234813 in words is "six hundred eighty-one trillion, one hundred one billion, two hundred seventy-two million, two hundred thirty-four thousand, eight hundred thirteen".