2166654981717 has 24 divisors (see below), whose sum is σ = 3173025121344. Its totient is φ = 1424406924864.

The previous prime is 2166654981709. The next prime is 2166654981763. The reversal of 2166654981717 is 7171894566612.

It is not a de Polignac number, because 2166654981717 - 2³ = 2166654981709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166654981767) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3615838 + ... + 4172240.

It is an arithmetic number, because the mean of its divisors is an integer number (132209380056).

Almost surely, 2^{2166654981717} is an apocalyptic number.

It is an amenable number.

2166654981717 is a deficient number, since it is larger than the sum of its proper divisors (1006370139627).

2166654981717 is a wasteful number, since it uses less digits than its factorization.

2166654981717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562409 (or 562406 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 2166654981717 in words is "two trillion, one hundred sixty-six billion, six hundred fifty-four million, nine hundred eighty-one thousand, seven hundred seventeen".