1644061166 has 32 divisors (see below), whose sum is σ = 2745713376. Its totient is φ = 731952000.

The previous prime is 1644061147. The next prime is 1644061169. The reversal of 1644061166 is 6611604461.

It is a super-3 number, since 3×1644061166³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644061169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1189796 + ... + 1191176.

It is an arithmetic number, because the mean of its divisors is an integer number (85803543).

Almost surely, 2^1644061166 is an apocalyptic number.

1644061166 is a deficient number, since it is larger than the sum of its proper divisors (1101652210).

1644061166 is a wasteful number, since it uses less digits than its factorization.

1644061166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1644061166 is about 40547.0241324810. The cubic root of 1644061166 is about 1180.2463255748.

The spelling of 1644061166 in words is "one billion, six hundred forty-four million, sixty-one thousand, one hundred sixty-six".