166553166 has 64 divisors (see below), whose sum is σ = 376814592. Its totient is φ = 48694272.

The previous prime is 166553161. The next prime is 166553197. The reversal of 166553166 is 661355661.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166553161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 471646 + ... + 471998.

It is an arithmetic number, because the mean of its divisors is an integer number (5887728).

Almost surely, 2^166553166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166553166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188407296).

166553166 is an abundant number, since it is smaller than the sum of its proper divisors (210261426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166553166 is a wasteful number, since it uses less digits than its factorization.

166553166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657.

The product of its digits is 97200, while the sum is 39.

The square root of 166553166 is about 12905.5478767854. The cubic root of 166553166 is about 550.1962561325.

The spelling of 166553166 in words is "one hundred sixty-six million, five hundred fifty-three thousand, one hundred sixty-six".