2144705155866 has 192 divisors, whose sum is σ = 5919334686720. Its totient is φ = 545940984960.

The previous prime is 2144705155861. The next prime is 2144705155867. The reversal of 2144705155866 is 6685515074412.

2144705155866 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 7 + 0 + 51 + 5 + 586 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (2144705155861) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19189141 + ... + 19300583.

It is an arithmetic number, because the mean of its divisors is an integer number (30829868160).

Almost surely, 2^{2144705155866} is an apocalyptic number.

2144705155866 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 2144705155866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2959667343360).

2144705155866 is an abundant number, since it is smaller than the sum of its proper divisors (3774629530854).

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

2144705155866 is a wasteful number, since it uses less digits than its factorization.

2144705155866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111881 (or 111878 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 54.

The spelling of 2144705155866 in words is "two trillion, one hundred forty-four billion, seven hundred five million, one hundred fifty-five thousand, eight hundred sixty-six".