166540025010156 has 96 divisors (see below), whose sum is σ = 455126386111488. Its totient is φ = 46403145277440.

The previous prime is 166540025010137. The next prime is 166540025010179. The reversal of 166540025010156 is 651010520045661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1633845 + ... + 18323468.

It is an arithmetic number, because the mean of its divisors is an integer number (4740899855328).

Almost surely, 2^{166540025010156} 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 166540025010156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227563193055744).

166540025010156 is an abundant number, since it is smaller than the sum of its proper divisors (288586361101332).

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

166540025010156 is a wasteful number, since it uses less digits than its factorization.

166540025010156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19959791 (or 19959789 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 166540025010156 in words is "one hundred sixty-six trillion, five hundred forty billion, twenty-five million, ten thousand, one hundred fifty-six".