2166210617766 has 64 divisors (see below), whose sum is σ = 4837321944000. Its totient is φ = 642109095936.

The previous prime is 2166210617759. The next prime is 2166210617783. The reversal of 2166210617766 is 6677160126612.

It is a congruent number.

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, 50791 + ... + 2082066.

It is an arithmetic number, because the mean of its divisors is an integer number (75583155375).

Almost surely, 2^{2166210617766} is an apocalyptic number.

2166210617766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166210617766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2418660972000).

2166210617766 is an abundant number, since it is smaller than the sum of its proper divisors (2671111326234).

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

2166210617766 is a wasteful number, since it uses less digits than its factorization.

2166210617766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133353.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 2166210617766 in words is "two trillion, one hundred sixty-six billion, two hundred ten million, six hundred seventeen thousand, seven hundred sixty-six".