84188690557 has 2 divisors, whose sum is σ = 84188690558. Its totient is φ = 84188690556.

The previous prime is 84188690549. The next prime is 84188690567. The reversal of 84188690557 is 75509688148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80262289636 + 3926400921 = 283306^2 + 62661^2 .

It is a cyclic number.

It is not a de Polignac number, because 84188690557 - 2³ = 84188690549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84188690495 and 84188690504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84188690567) 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 as a sum of consecutive naturals, namely, 42094345278 + 42094345279.

It is an arithmetic number, because the mean of its divisors is an integer number (42094345279).

Almost surely, 2^84188690557 is an apocalyptic number.

It is an amenable number.

84188690557 is a deficient number, since it is larger than the sum of its proper divisors (1).

84188690557 is an equidigital number, since it uses as much as digits as its factorization.

84188690557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19353600, while the sum is 61.

The spelling of 84188690557 in words is "eighty-four billion, one hundred eighty-eight million, six hundred ninety thousand, five hundred fifty-seven".