166204640 has 96 divisors (see below), whose sum is σ = 463325184. Its totient is φ = 55134720.

The previous prime is 166204627. The next prime is 166204667. The reversal of 166204640 is 46402661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32327 + ... + 37113.

It is an arithmetic number, because the mean of its divisors is an integer number (4826304).

Almost surely, 2^166204640 is an apocalyptic number.

166204640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166204640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231662592).

166204640 is an abundant number, since it is smaller than the sum of its proper divisors (297120544).

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

166204640 is a wasteful number, since it uses less digits than its factorization.

166204640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840 (or 4832 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 166204640 is about 12892.0378528765. The cubic root of 166204640 is about 549.8122113720.

The spelling of 166204640 in words is "one hundred sixty-six million, two hundred four thousand, six hundred forty".