84006155521 has 2 divisors, whose sum is σ = 84006155522. Its totient is φ = 84006155520.

The previous prime is 84006155483. The next prime is 84006155561. The reversal of 84006155521 is 12555160048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76266554896 + 7739600625 = 276164^2 + 87975^2 .

It is a cyclic number.

It is not a de Polignac number, because 84006155521 - 2¹⁷ = 84006024449 is a prime.

It is not a weakly prime, because it can be changed into another prime (84006155561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42003077760 + 42003077761.

It is an arithmetic number, because the mean of its divisors is an integer number (42003077761).

Almost surely, 2^84006155521 is an apocalyptic number.

It is an amenable number.

84006155521 is a deficient number, since it is larger than the sum of its proper divisors (1).

84006155521 is an equidigital number, since it uses as much as digits as its factorization.

84006155521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 37.

The spelling of 84006155521 in words is "eighty-four billion, six million, one hundred fifty-five thousand, five hundred twenty-one".