166238742852 has 384 divisors, whose sum is σ = 562396692480. Its totient is φ = 41279362560.

The previous prime is 166238742841. The next prime is 166238742853. The reversal of 166238742852 is 258247832661.

166238742852 is a `hidden beast` number, since 1 + 6 + 623 + 8 + 7 + 4 + 2 + 8 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (166238742853) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11265343 + ... + 11280089.

It is an arithmetic number, because the mean of its divisors is an integer number (1464574720).

Almost surely, 2^166238742852 is an apocalyptic number.

166238742852 is a gapful number since it is divisible by the number (12) 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 166238742852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281198346240).

166238742852 is an abundant number, since it is smaller than the sum of its proper divisors (396157949628).

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

166238742852 is a wasteful number, since it uses less digits than its factorization.

166238742852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14848 (or 14840 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The spelling of 166238742852 in words is "one hundred sixty-six billion, two hundred thirty-eight million, seven hundred forty-two thousand, eight hundred fifty-two".