166558534627 has 4 divisors (see below), whose sum is σ = 166733308440. Its totient is φ = 166383760816.

The previous prime is 166558534613. The next prime is 166558534631. The reversal of 166558534627 is 726435855661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 726435855661 = 281 ⋅2585180981.

It is a cyclic number.

It is not a de Polignac number, because 166558534627 - 2³⁵ = 132198796259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166558534607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87385477 + ... + 87387382.

It is an arithmetic number, because the mean of its divisors is an integer number (41683327110).

Almost surely, 2^166558534627 is an apocalyptic number.

166558534627 is a deficient number, since it is larger than the sum of its proper divisors (174773813).

166558534627 is an equidigital number, since it uses as much as digits as its factorization.

166558534627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174773812.

The product of its digits is 36288000, while the sum is 58.

The spelling of 166558534627 in words is "one hundred sixty-six billion, five hundred fifty-eight million, five hundred thirty-four thousand, six hundred twenty-seven".