20166843663 has 6 divisors (see below), whose sum is σ = 29129885304. Its totient is φ = 13444562436.

The previous prime is 20166843643. The next prime is 20166843701. The reversal of 20166843663 is 36634866102.

20166843663 is a `hidden beast` number, since 201 + 6 + 6 + 8 + 436 + 6 + 3 = 666.

It is not a de Polignac number, because 20166843663 - 2⁸ = 20166843407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166843643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1120380195 + ... + 1120380212.

It is an arithmetic number, because the mean of its divisors is an integer number (4854980884).

Almost surely, 2^20166843663 is an apocalyptic number.

20166843663 is a deficient number, since it is larger than the sum of its proper divisors (8963041641).

20166843663 is a wasteful number, since it uses less digits than its factorization.

20166843663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240760413 (or 2240760410 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The spelling of 20166843663 in words is "twenty billion, one hundred sixty-six million, eight hundred forty-three thousand, six hundred sixty-three".