681236718711 has 4 divisors (see below), whose sum is σ = 908315624952. Its totient is φ = 454157812472.

The previous prime is 681236718709. The next prime is 681236718731. The reversal of 681236718711 is 117817632186.

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 681236718711 - 2¹ = 681236718709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681236718731) 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, 113539453116 + ... + 113539453121.

It is an arithmetic number, because the mean of its divisors is an integer number (227078906238).

Almost surely, 2^681236718711 is an apocalyptic number.

681236718711 is a deficient number, since it is larger than the sum of its proper divisors (227078906241).

681236718711 is a wasteful number, since it uses less digits than its factorization.

681236718711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227078906240.

The product of its digits is 677376, while the sum is 51.

The spelling of 681236718711 in words is "six hundred eighty-one billion, two hundred thirty-six million, seven hundred eighteen thousand, seven hundred eleven".