2166403863 has 8 divisors (see below), whose sum is σ = 3110733808. Its totient is φ = 1333171584.

The previous prime is 2166403861. The next prime is 2166403871. The reversal of 2166403863 is 3683046612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2166403863 - 2¹ = 2166403861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 55548817 = 2166403863 / (2 + 1 + 6 + 6 + 4 + 0 + 3 + 8 + 6 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166403861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27774370 + ... + 27774447.

It is an arithmetic number, because the mean of its divisors is an integer number (388841726).

Almost surely, 2^2166403863 is an apocalyptic number.

2166403863 is a deficient number, since it is larger than the sum of its proper divisors (944329945).

2166403863 is a wasteful number, since it uses less digits than its factorization.

2166403863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55548833.

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 2166403863 is about 46544.6437627360. The cubic root of 2166403863 is about 1293.9370262794.

The spelling of 2166403863 in words is "two billion, one hundred sixty-six million, four hundred three thousand, eight hundred sixty-three".