78889521133 has 2 divisors, whose sum is σ = 78889521134. Its totient is φ = 78889521132.

The previous prime is 78889521127. The next prime is 78889521149. The reversal of 78889521133 is 33112598887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64527176484 + 14362344649 = 254022^2 + 119843^2 .

It is a cyclic number.

It is not a de Polignac number, because 78889521133 - 2¹³ = 78889512941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78889522133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39444760566 + 39444760567.

It is an arithmetic number, because the mean of its divisors is an integer number (39444760567).

Almost surely, 2^78889521133 is an apocalyptic number.

It is an amenable number.

78889521133 is a deficient number, since it is larger than the sum of its proper divisors (1).

78889521133 is an equidigital number, since it uses as much as digits as its factorization.

78889521133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 55.

The spelling of 78889521133 in words is "seventy-eight billion, eight hundred eighty-nine million, five hundred twenty-one thousand, one hundred thirty-three".