166620573 has 24 divisors (see below), whose sum is σ = 284544000. Its totient is φ = 91927584.

The previous prime is 166620541. The next prime is 166620607. The reversal of 166620573 is 375026661.

It is not a de Polignac number, because 166620573 - 2⁵ = 166620541 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166620373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43773 + ... + 47426.

It is an arithmetic number, because the mean of its divisors is an integer number (11856000).

Almost surely, 2^166620573 is an apocalyptic number.

It is an amenable number.

166620573 is a deficient number, since it is larger than the sum of its proper divisors (117923427).

166620573 is a wasteful number, since it uses less digits than its factorization.

166620573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91241 (or 91238 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 166620573 is about 12908.1591638777. The cubic root of 166620573 is about 550.2704708268.

The spelling of 166620573 in words is "one hundred sixty-six million, six hundred twenty thousand, five hundred seventy-three".