87666605529 has 16 divisors (see below), whose sum is σ = 121494338112. Its totient is φ = 56179700928.

The previous prime is 87666605479. The next prime is 87666605561. The reversal of 87666605529 is 92550666678.

It is a happy number.

It is not a de Polignac number, because 87666605529 - 2¹⁹ = 87666081241 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87666605729) 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, 4748554 + ... + 4766979.

It is an arithmetic number, because the mean of its divisors is an integer number (7593396132).

Almost surely, 2^87666605529 is an apocalyptic number.

It is an amenable number.

87666605529 is a deficient number, since it is larger than the sum of its proper divisors (33827732583).

87666605529 is a wasteful number, since it uses less digits than its factorization.

87666605529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9515656.

The product of its (nonzero) digits is 32659200, while the sum is 60.

The spelling of 87666605529 in words is "eighty-seven billion, six hundred sixty-six million, six hundred five thousand, five hundred twenty-nine".