680026042081 has 4 divisors (see below), whose sum is σ = 680281405632. Its totient is φ = 679770678532.

The previous prime is 680026042043. The next prime is 680026042093. The reversal of 680026042081 is 180240620086.

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, and also an emirpimes, since its reverse is a distinct semiprime: 180240620086 = 2 ⋅90120310043.

It is a cyclic number.

It is not a de Polignac number, because 680026042081 - 2¹¹ = 680026040033 is a prime.

It is a super-2 number, since 2×680026042081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 680026042081.

It is not an unprimeable number, because it can be changed into a prime (680026042001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127677781 + ... + 127683106.

It is an arithmetic number, because the mean of its divisors is an integer number (170070351408).

Almost surely, 2^680026042081 is an apocalyptic number.

It is an amenable number.

680026042081 is a deficient number, since it is larger than the sum of its proper divisors (255363551).

680026042081 is a wasteful number, since it uses less digits than its factorization.

680026042081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255363550.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 680026042081 in words is "six hundred eighty billion, twenty-six million, forty-two thousand, eighty-one".