68166546181 has 4 divisors (see below), whose sum is σ = 68172885664. Its totient is φ = 68160206700.

The previous prime is 68166546131. The next prime is 68166546193. The reversal of 68166546181 is 18164566186.

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 not a de Polignac number, because 68166546181 - 2⁷ = 68166546053 is a prime.

It is a super-2 number, since 2×68166546181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68166546121) 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, 3153585 + ... + 3175126.

It is an arithmetic number, because the mean of its divisors is an integer number (17043221416).

Almost surely, 2^68166546181 is an apocalyptic number.

It is an amenable number.

68166546181 is a deficient number, since it is larger than the sum of its proper divisors (6339483).

68166546181 is a wasteful number, since it uses less digits than its factorization.

68166546181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6339482.

The product of its digits is 1658880, while the sum is 52.

The spelling of 68166546181 in words is "sixty-eight billion, one hundred sixty-six million, five hundred forty-six thousand, one hundred eighty-one".