2166155240500 has 192 divisors, whose sum is σ = 5219149178880. Its totient is φ = 781801728000.

The previous prime is 2166155240471. The next prime is 2166155240521. The reversal of 2166155240500 is 50425516612.

It is a super-3 number, since 3×2166155240500³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 2166155240500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28156086 + ... + 28232914.

It is an arithmetic number, because the mean of its divisors is an integer number (27183068640).

Almost surely, 2^{2166155240500} is an apocalyptic number.

2166155240500 is a gapful number since it is divisible by the number (20) 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 2166155240500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2609574589440).

2166155240500 is an abundant number, since it is smaller than the sum of its proper divisors (3052993938380).

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

2166155240500 is a wasteful number, since it uses less digits than its factorization.

2166155240500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77003 (or 76991 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 2166155240500 in words is "two trillion, one hundred sixty-six billion, one hundred fifty-five million, two hundred forty thousand, five hundred".