681049693927 has 4 divisors (see below), whose sum is σ = 716894414680. Its totient is φ = 645204973176.

The previous prime is 681049693843. The next prime is 681049693949. The reversal of 681049693927 is 729396940186.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681049693927 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 (681049693997) 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, 17922360348 + ... + 17922360385.

It is an arithmetic number, because the mean of its divisors is an integer number (179223603670).

Almost surely, 2^681049693927 is an apocalyptic number.

681049693927 is a deficient number, since it is larger than the sum of its proper divisors (35844720753).

681049693927 is a wasteful number, since it uses less digits than its factorization.

681049693927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35844720752.

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 681049693927 in words is "six hundred eighty-one billion, forty-nine million, six hundred ninety-three thousand, nine hundred twenty-seven".