1644163413 has 8 divisors (see below), whose sum is σ = 2251467168. Its totient is φ = 1066484304.

The previous prime is 1644163397. The next prime is 1644163421. The reversal of 1644163413 is 3143614461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1644163413 - 2⁴ = 1644163397 is a prime.

It is a super-3 number, since 3×1644163413³ (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 (1644163813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7406031 + ... + 7406252.

It is an arithmetic number, because the mean of its divisors is an integer number (281433396).

Almost surely, 2^1644163413 is an apocalyptic number.

It is an amenable number.

1644163413 is a deficient number, since it is larger than the sum of its proper divisors (607303755).

1644163413 is a wasteful number, since it uses less digits than its factorization.

1644163413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14812323.

The product of its digits is 20736, while the sum is 33.

The square root of 1644163413 is about 40548.2849575663. The cubic root of 1644163413 is about 1180.2707922526.

Adding to 1644163413 its reverse (3143614461), we get a palindrome (4787777874).

The spelling of 1644163413 in words is "one billion, six hundred forty-four million, one hundred sixty-three thousand, four hundred thirteen".