1644260166 has 12 divisors (see below), whose sum is σ = 3562563732. Its totient is φ = 548086716.

The previous prime is 1644260161. The next prime is 1644260197. The reversal of 1644260166 is 6610624461.

1644260166 is a `hidden beast` number, since 1 + 6 + 4 + 42 + 601 + 6 + 6 = 666.

It is a super-3 number, since 3×1644260166³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1644260166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644260161) 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, 45673876 + ... + 45673911.

It is an arithmetic number, because the mean of its divisors is an integer number (296880311).

Almost surely, 2^1644260166 is an apocalyptic number.

1644260166 is an abundant number, since it is smaller than the sum of its proper divisors (1918303566).

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

1644260166 is a wasteful number, since it uses less digits than its factorization.

1644260166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91347795 (or 91347792 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1644260166 is about 40549.4779991062. The cubic root of 1644260166 is about 1180.2939433374.

The spelling of 1644260166 in words is "one billion, six hundred forty-four million, two hundred sixty thousand, one hundred sixty-six".