681027707557 has 4 divisors (see below), whose sum is σ = 681080435680. Its totient is φ = 680974979436.

The previous prime is 681027707551. The next prime is 681027707561. The reversal of 681027707557 is 755707720186.

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 a de Polignac number, because none of the positive numbers 2^k-681027707557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681027707498 and 681027707507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681027707551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26344683 + ... + 26370520.

It is an arithmetic number, because the mean of its divisors is an integer number (170270108920).

Almost surely, 2^681027707557 is an apocalyptic number.

It is an amenable number.

681027707557 is a deficient number, since it is larger than the sum of its proper divisors (52728123).

681027707557 is a wasteful number, since it uses less digits than its factorization.

681027707557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52728122.

The product of its (nonzero) digits is 5762400, while the sum is 55.

The spelling of 681027707557 in words is "six hundred eighty-one billion, twenty-seven million, seven hundred seven thousand, five hundred fifty-seven".