69681991581887 has 16 divisors (see below), whose sum is σ = 70944750305280. Its totient is φ = 68428864982400.

The previous prime is 69681991581857. The next prime is 69681991581893. The reversal of 69681991581887 is 78818519918696.

69681991581887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 69681991581887 - 2³⁴ = 69664811712703 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 69681991581799 and 69681991581808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69681991581857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95496962 + ... + 96223872.

It is an arithmetic number, because the mean of its divisors is an integer number (4434046894080).

Almost surely, 2^{69681991581887} is an apocalyptic number.

69681991581887 is a deficient number, since it is larger than the sum of its proper divisors (1262758723393).

69681991581887 is a wasteful number, since it uses less digits than its factorization.

69681991581887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733534.

The product of its digits is 3762339840, while the sum is 86.

The spelling of 69681991581887 in words is "sixty-nine trillion, six hundred eighty-one billion, nine hundred ninety-one million, five hundred eighty-one thousand, eight hundred eighty-seven".