2166856489485 has 192 divisors, whose sum is σ = 4155070832640. Its totient is φ = 1081361975040.

The previous prime is 2166856489459. The next prime is 2166856489493. The reversal of 2166856489485 is 5849846586612.

2166856489485 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 8 + 5 + 64 + 89 + 485 = 666.

It is not a de Polignac number, because 2166856489485 - 2¹² = 2166856485389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 227152846 + ... + 227162384.

It is an arithmetic number, because the mean of its divisors is an integer number (21640993920).

Almost surely, 2^{2166856489485} is an apocalyptic number.

It is an amenable number.

2166856489485 is a deficient number, since it is larger than the sum of its proper divisors (1988214343155).

2166856489485 is a wasteful number, since it uses less digits than its factorization.

2166856489485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9790 (or 9778 counting only the distinct ones).

The product of its digits is 796262400, while the sum is 72.

The spelling of 2166856489485 in words is "two trillion, one hundred sixty-six billion, eight hundred fifty-six million, four hundred eighty-nine thousand, four hundred eighty-five".