166122021593 has 16 divisors (see below), whose sum is σ = 191766776832. Its totient is φ = 142419354000.

The previous prime is 166122021581. The next prime is 166122021629. The reversal of 166122021593 is 395120221661.

It is not a de Polignac number, because 166122021593 - 2⁸ = 166122021337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166122021193) 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, 4606043 + ... + 4641968.

It is an arithmetic number, because the mean of its divisors is an integer number (11985423552).

Almost surely, 2^166122021593 is an apocalyptic number.

It is an amenable number.

166122021593 is a deficient number, since it is larger than the sum of its proper divisors (25644755239).

166122021593 is a wasteful number, since it uses less digits than its factorization.

166122021593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9248116.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 166122021593 in words is "one hundred sixty-six billion, one hundred twenty-two million, twenty-one thousand, five hundred ninety-three".