84057523861 has 2 divisors, whose sum is σ = 84057523862. Its totient is φ = 84057523860.

The previous prime is 84057523843. The next prime is 84057523883. The reversal of 84057523861 is 16832575048.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63198943236 + 20858580625 = 251394^2 + 144425^2 .

It is a cyclic number.

It is not a de Polignac number, because 84057523861 - 2⁷ = 84057523733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84057523801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42028761930 + 42028761931.

It is an arithmetic number, because the mean of its divisors is an integer number (42028761931).

Almost surely, 2^84057523861 is an apocalyptic number.

It is an amenable number.

84057523861 is a deficient number, since it is larger than the sum of its proper divisors (1).

84057523861 is an equidigital number, since it uses as much as digits as its factorization.

84057523861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 84057523861 in words is "eighty-four billion, fifty-seven million, five hundred twenty-three thousand, eight hundred sixty-one".