68989181761 has 4 divisors (see below), whose sum is σ = 69197608624. Its totient is φ = 68780754900.

The previous prime is 68989181713. The next prime is 68989181777. The reversal of 68989181761 is 16718198986.

It is a happy number.

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 68989181761 - 2⁷ = 68989181633 is a prime.

It is a super-2 number, since 2×68989181761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68989181693 and 68989181702.

It is not an unprimeable number, because it can be changed into a prime (68989181711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104212935 + ... + 104213596.

It is an arithmetic number, because the mean of its divisors is an integer number (17299402156).

Almost surely, 2^68989181761 is an apocalyptic number.

It is an amenable number.

68989181761 is a deficient number, since it is larger than the sum of its proper divisors (208426863).

68989181761 is a wasteful number, since it uses less digits than its factorization.

68989181761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208426862.

The product of its digits is 10450944, while the sum is 64.

The spelling of 68989181761 in words is "sixty-eight billion, nine hundred eighty-nine million, one hundred eighty-one thousand, seven hundred sixty-one".