87815873021447 has 2 divisors, whose sum is σ = 87815873021448. Its totient is φ = 87815873021446.

The previous prime is 87815873021293. The next prime is 87815873021473. The reversal of 87815873021447 is 74412037851878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87815873021447 - 2¹⁶ = 87815872955911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87815873021647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43907936510723 + 43907936510724.

It is an arithmetic number, because the mean of its divisors is an integer number (43907936510724).

Almost surely, 2^{87815873021447} is an apocalyptic number.

87815873021447 is a deficient number, since it is larger than the sum of its proper divisors (1).

87815873021447 is an equidigital number, since it uses as much as digits as its factorization.

87815873021447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84295680, while the sum is 65.

The spelling of 87815873021447 in words is "eighty-seven trillion, eight hundred fifteen billion, eight hundred seventy-three million, twenty-one thousand, four hundred forty-seven".