84870231561 has 12 divisors (see below), whose sum is σ = 126817587780. Its totient is φ = 54629114400.

The previous prime is 84870231547. The next prime is 84870231581. The reversal of 84870231561 is 16513207848.

84870231561 is a `hidden beast` number, since 8 + 4 + 87 + 0 + 2 + 3 + 1 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31092621561 + 53777610000 = 176331^2 + 231900^2 .

It is not a de Polignac number, because 84870231561 - 2⁶ = 84870231497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84870231581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162586390 + ... + 162586911.

It is an arithmetic number, because the mean of its divisors is an integer number (10568132315).

Almost surely, 2^84870231561 is an apocalyptic number.

It is an amenable number.

84870231561 is a deficient number, since it is larger than the sum of its proper divisors (41947356219).

84870231561 is a wasteful number, since it uses less digits than its factorization.

84870231561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325173336 (or 325173333 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 84870231561 in words is "eighty-four billion, eight hundred seventy million, two hundred thirty-one thousand, five hundred sixty-one".