166318215272 has 64 divisors (see below), whose sum is σ = 344189139840. Its totient is φ = 74714112000.

The previous prime is 166318215251. The next prime is 166318215331. The reversal of 166318215272 is 272512813661.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6192272 + ... + 6219072.

It is an arithmetic number, because the mean of its divisors is an integer number (5377955310).

Almost surely, 2^166318215272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166318215272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172094569920).

166318215272 is an abundant number, since it is smaller than the sum of its proper divisors (177870924568).

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

166318215272 is a wasteful number, since it uses less digits than its factorization.

166318215272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27642 (or 27638 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The spelling of 166318215272 in words is "one hundred sixty-six billion, three hundred eighteen million, two hundred fifteen thousand, two hundred seventy-two".