166633208820 has 144 divisors (see below), whose sum is σ = 576355001040. Its totient is φ = 38604607488.

The previous prime is 166633208809. The next prime is 166633208849. The reversal of 166633208820 is 28802336661.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 27994643856 + 138638564964 = 167316^2 + 372342^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2054655 + ... + 2134214.

It is an arithmetic number, because the mean of its divisors is an integer number (4002465285).

Almost surely, 2^166633208820 is an apocalyptic number.

166633208820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166633208820 is an abundant number, since it is smaller than the sum of its proper divisors (409721792220).

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

166633208820 is a wasteful number, since it uses less digits than its factorization.

166633208820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188914 (or 4188909 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 166633208820 in words is "one hundred sixty-six billion, six hundred thirty-three million, two hundred eight thousand, eight hundred twenty".