68149702289 has 4 divisors (see below), whose sum is σ = 72158508324. Its totient is φ = 64140896256.

The previous prime is 68149702217. The next prime is 68149702319. The reversal of 68149702289 is 98220794186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33963541264 + 34186161025 = 184292^2 + 184895^2 .

It is a cyclic number.

It is not a de Polignac number, because 68149702289 - 2¹² = 68149698193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68149701289) 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, 2004402992 + ... + 2004403025.

It is an arithmetic number, because the mean of its divisors is an integer number (18039627081).

Almost surely, 2^68149702289 is an apocalyptic number.

It is an amenable number.

68149702289 is a deficient number, since it is larger than the sum of its proper divisors (4008806035).

68149702289 is a wasteful number, since it uses less digits than its factorization.

68149702289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008806034.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 68149702289 in words is "sixty-eight billion, one hundred forty-nine million, seven hundred two thousand, two hundred eighty-nine".