1643225166 has 48 divisors (see below), whose sum is σ = 3949845120. Its totient is φ = 489503760.

The previous prime is 1643225131. The next prime is 1643225261. The reversal of 1643225166 is 6615223461.

1643225166 is a `hidden beast` number, since 1 + 643 + 2 + 2 + 5 + 1 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1643225166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58650 + ... + 82013.

It is an arithmetic number, because the mean of its divisors is an integer number (82288440).

Almost surely, 2^1643225166 is an apocalyptic number.

1643225166 is an abundant number, since it is smaller than the sum of its proper divisors (2306619954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1643225166 is a wasteful number, since it uses less digits than its factorization.

1643225166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140741 (or 140738 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1643225166 is about 40536.7138036620. The cubic root of 1643225166 is about 1180.0462411258.

The spelling of 1643225166 in words is "one billion, six hundred forty-three million, two hundred twenty-five thousand, one hundred sixty-six".