2188188646 has 16 divisors (see below), whose sum is σ = 3764729376. Its totient is φ = 934407936.

The previous prime is 2188188631. The next prime is 2188188659. The reversal of 2188188646 is 6468818812.

2188188646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2188188593 and 2188188602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278251 + ... + 286006.

It is an arithmetic number, because the mean of its divisors is an integer number (235295586).

Almost surely, 2^2188188646 is an apocalyptic number.

2188188646 is a deficient number, since it is larger than the sum of its proper divisors (1576540730).

2188188646 is a wasteful number, since it uses less digits than its factorization.

2188188646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564543.

The product of its digits is 1179648, while the sum is 52.

The square root of 2188188646 is about 46778.0786907714. The cubic root of 2188188646 is about 1298.2597317534.

The spelling of 2188188646 in words is "two billion, one hundred eighty-eight million, one hundred eighty-eight thousand, six hundred forty-six".