166556562443520 has 288 divisors, whose sum is σ = 538569220506240. Its totient is φ = 43864224399360.

The previous prime is 166556562443461. The next prime is 166556562443527. The reversal of 166556562443520 is 25344265655661.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166556562443527) 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, 127849830 + ... + 129146010.

Almost surely, 2^{166556562443520} is an apocalyptic number.

166556562443520 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 166556562443520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269284610253120).

166556562443520 is an abundant number, since it is smaller than the sum of its proper divisors (372012658062720).

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

166556562443520 is a wasteful number, since it uses less digits than its factorization.

166556562443520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296621 (or 1296607 counting only the distinct ones).

The product of its (nonzero) digits is 155520000, while the sum is 60.

The spelling of 166556562443520 in words is "one hundred sixty-six trillion, five hundred fifty-six billion, five hundred sixty-two million, four hundred forty-three thousand, five hundred twenty".