8111079789781 has 2 divisors, whose sum is σ = 8111079789782. Its totient is φ = 8111079789780.

The previous prime is 8111079789773. The next prime is 8111079789887. The reversal of 8111079789781 is 1879879701118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7958323102500 + 152756687281 = 2821050^2 + 390841^2 .

It is a cyclic number.

It is not a de Polignac number, because 8111079789781 - 2³ = 8111079789773 is a prime.

It is a super-2 number, since 2×8111079789781² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8111079780781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4055539894890 + 4055539894891.

It is an arithmetic number, because the mean of its divisors is an integer number (4055539894891).

Almost surely, 2^{8111079789781} is an apocalyptic number.

It is an amenable number.

8111079789781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8111079789781 is an equidigital number, since it uses as much as digits as its factorization.

8111079789781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14224896, while the sum is 67.

The spelling of 8111079789781 in words is "eight trillion, one hundred eleven billion, seventy-nine million, seven hundred eighty-nine thousand, seven hundred eighty-one".