69681991581889 has 4 divisors (see below), whose sum is σ = 69682519156356. Its totient is φ = 69681464007424.

The previous prime is 69681991581857. The next prime is 69681991581893. The reversal of 69681991581889 is 98818519918696.

It is a happy number.

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 3979294863489 + 65702696718400 = 1994817^2 + 8105720^2 .

It is a cyclic number.

It is not a de Polignac number, because 69681991581889 - 2⁵ = 69681991581857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69681991581589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263589064 + ... + 263853289.

It is an arithmetic number, because the mean of its divisors is an integer number (17420629789089).

Almost surely, 2^{69681991581889} is an apocalyptic number.

It is an amenable number.

69681991581889 is a deficient number, since it is larger than the sum of its proper divisors (527574467).

69681991581889 is a wasteful number, since it uses less digits than its factorization.

69681991581889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527574466.

The product of its digits is 4837294080, while the sum is 88.

The spelling of 69681991581889 in words is "sixty-nine trillion, six hundred eighty-one billion, nine hundred ninety-one million, five hundred eighty-one thousand, eight hundred eighty-nine".