166551330 has 64 divisors (see below), whose sum is σ = 437446656. Its totient is φ = 40248000.

The previous prime is 166551293. The next prime is 166551331. The reversal of 166551330 is 33155661.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (166551331) 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, 141645 + ... + 142815.

It is an arithmetic number, because the mean of its divisors is an integer number (6835104).

Almost surely, 2^166551330 is an apocalyptic number.

166551330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166551330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218723328).

166551330 is an abundant number, since it is smaller than the sum of its proper divisors (270895326).

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

166551330 is a wasteful number, since it uses less digits than its factorization.

166551330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 166551330 is about 12905.4767443903. The cubic root of 166551330 is about 550.1942344277.

The spelling of 166551330 in words is "one hundred sixty-six million, five hundred fifty-one thousand, three hundred thirty".