87668566427821 has 16 divisors (see below), whose sum is σ = 88786926970560. Its totient is φ = 86551703861760.

The previous prime is 87668566427809. The next prime is 87668566427851. The reversal of 87668566427821 is 12872466586678.

It is a cyclic number.

It is not a de Polignac number, because 87668566427821 - 2⁴¹ = 85469543172269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87668566427851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 798172935 + ... + 798282763.

It is an arithmetic number, because the mean of its divisors is an integer number (5549182935660).

Almost surely, 2^{87668566427821} is an apocalyptic number.

It is an amenable number.

87668566427821 is a deficient number, since it is larger than the sum of its proper divisors (1118360542739).

87668566427821 is a wasteful number, since it uses less digits than its factorization.

87668566427821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116556.

The product of its digits is 2601123840, while the sum is 76.

The spelling of 87668566427821 in words is "eighty-seven trillion, six hundred sixty-eight billion, five hundred sixty-six million, four hundred twenty-seven thousand, eight hundred twenty-one".