67799787681 has 8 divisors (see below), whose sum is σ = 92105372160. Its totient is φ = 44347030832.

The previous prime is 67799787659. The next prime is 67799787683. The reversal of 67799787681 is 18678799776.

67799787681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67799787681 - 2⁷ = 67799787553 is a prime.

It is a super-2 number, since 2×67799787681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67799787683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213206721 + ... + 213207038.

It is an arithmetic number, because the mean of its divisors is an integer number (11513171520).

Almost surely, 2^67799787681 is an apocalyptic number.

It is an amenable number.

67799787681 is a deficient number, since it is larger than the sum of its proper divisors (24305584479).

67799787681 is a wasteful number, since it uses less digits than its factorization.

67799787681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426413815.

The product of its digits is 448084224, while the sum is 75.

The spelling of 67799787681 in words is "sixty-seven billion, seven hundred ninety-nine million, seven hundred eighty-seven thousand, six hundred eighty-one".