69681991581893 has 2 divisors, whose sum is σ = 69681991581894. Its totient is φ = 69681991581892.

The previous prime is 69681991581857. The next prime is 69681991581919. The reversal of 69681991581893 is 39818519918696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44223125102209 + 25458866479684 = 6650047^2 + 5045678^2 .

It is a cyclic number.

It is not a de Polignac number, because 69681991581893 - 2⁸ = 69681991581637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69681991571893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34840995790946 + 34840995790947.

It is an arithmetic number, because the mean of its divisors is an integer number (34840995790947).

Almost surely, 2^{69681991581893} is an apocalyptic number.

It is an amenable number.

69681991581893 is a deficient number, since it is larger than the sum of its proper divisors (1).

69681991581893 is an equidigital number, since it uses as much as digits as its factorization.

69681991581893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1813985280, while the sum is 83.

The spelling of 69681991581893 in words is "sixty-nine trillion, six hundred eighty-one billion, nine hundred ninety-one million, five hundred eighty-one thousand, eight hundred ninety-three".