84421891157 has 2 divisors, whose sum is σ = 84421891158. Its totient is φ = 84421891156.

The previous prime is 84421891153. The next prime is 84421891171. The reversal of 84421891157 is 75119812448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75852871396 + 8569019761 = 275414^2 + 92569^2 .

It is a cyclic number.

It is not a de Polignac number, because 84421891157 - 2² = 84421891153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84421891153) 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 as a sum of consecutive naturals, namely, 42210945578 + 42210945579.

It is an arithmetic number, because the mean of its divisors is an integer number (42210945579).

Almost surely, 2^84421891157 is an apocalyptic number.

It is an amenable number.

84421891157 is a deficient number, since it is larger than the sum of its proper divisors (1).

84421891157 is an equidigital number, since it uses as much as digits as its factorization.

84421891157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 50.

The spelling of 84421891157 in words is "eighty-four billion, four hundred twenty-one million, eight hundred ninety-one thousand, one hundred fifty-seven".