68129976181 has 4 divisors (see below), whose sum is σ = 69284721600. Its totient is φ = 66975230764.

The previous prime is 68129976139. The next prime is 68129976191. The reversal of 68129976181 is 18167992186.

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: 18167992186 = 2 ⋅9083996093.

It is a cyclic number.

It is not a de Polignac number, because 68129976181 - 2²⁵ = 68096421749 is a prime.

It is a super-2 number, since 2×68129976181² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68129976121) 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, 577372621 + ... + 577372738.

It is an arithmetic number, because the mean of its divisors is an integer number (17321180400).

Almost surely, 2^68129976181 is an apocalyptic number.

It is an amenable number.

68129976181 is a deficient number, since it is larger than the sum of its proper divisors (1154745419).

68129976181 is a wasteful number, since it uses less digits than its factorization.

68129976181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154745418.

The product of its digits is 2612736, while the sum is 58.

The spelling of 68129976181 in words is "sixty-eight billion, one hundred twenty-nine million, nine hundred seventy-six thousand, one hundred eighty-one".