166821288 has 16 divisors (see below), whose sum is σ = 417053280. Its totient is φ = 55607088.

The previous prime is 166821269. The next prime is 166821313. The reversal of 166821288 is 882128661.

166821288 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3475420 + ... + 3475467.

It is an arithmetic number, because the mean of its divisors is an integer number (26065830).

Almost surely, 2^166821288 is an apocalyptic number.

It is an amenable number.

166821288 is an abundant number, since it is smaller than the sum of its proper divisors (250231992).

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

166821288 is a wasteful number, since it uses less digits than its factorization.

166821288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6950896 (or 6950892 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 166821288 is about 12915.9315575765. The cubic root of 166821288 is about 550.4913383464.

The spelling of 166821288 in words is "one hundred sixty-six million, eight hundred twenty-one thousand, two hundred eighty-eight".