166586158420 has 96 divisors (see below), whose sum is σ = 385428637440. Its totient is φ = 59975285760.

The previous prime is 166586158411. The next prime is 166586158423. The reversal of 166586158420 is 24851685661.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166586158423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57382689 + ... + 57385591.

It is an arithmetic number, because the mean of its divisors is an integer number (4014881640).

Almost surely, 2^166586158420 is an apocalyptic number.

166586158420 is a gapful number since it is divisible by the number (10) 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 166586158420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192714318720).

166586158420 is an abundant number, since it is smaller than the sum of its proper divisors (218842479020).

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

166586158420 is a wasteful number, since it uses less digits than its factorization.

166586158420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425 (or 5423 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 166586158420 in words is "one hundred sixty-six billion, five hundred eighty-six million, one hundred fifty-eight thousand, four hundred twenty".