1644071116 has 12 divisors (see below), whose sum is σ = 2944034632. Its totient is φ = 802918368.

The previous prime is 1644071113. The next prime is 1644071137. The reversal of 1644071116 is 6111704461.

It is a super-3 number, since 3×1644071116³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644071111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4779105 + ... + 4779448.

Almost surely, 2^1644071116 is an apocalyptic number.

It is an amenable number.

1644071116 is a deficient number, since it is larger than the sum of its proper divisors (1299963516).

1644071116 is a wasteful number, since it uses less digits than its factorization.

1644071116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9558600 (or 9558598 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1644071116 is about 40547.1468293393. The cubic root of 1644071116 is about 1180.2487065542.

Adding to 1644071116 its reverse (6111704461), we get a palindrome (7755775577).

The spelling of 1644071116 in words is "one billion, six hundred forty-four million, seventy-one thousand, one hundred sixteen".