1644364413 has 6 divisors (see below), whose sum is σ = 2375193054. Its totient is φ = 1096242936.

The previous prime is 1644364399. The next prime is 1644364427. The reversal of 1644364413 is 3144634461.

1644364413 is a `hidden beast` number, since 1 + 6 + 4 + 4 + 3 + 644 + 1 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (1644364399) and next prime (1644364427).

It can be written as a sum of positive squares in only one way, i.e., 1643653764 + 710649 = 40542^2 + 843^2 .

It is not a de Polignac number, because 1644364413 - 2¹⁰ = 1644363389 is a prime.

It is a super-3 number, since 3×1644364413³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644364483) 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, 91353570 + ... + 91353587.

It is an arithmetic number, because the mean of its divisors is an integer number (395865509).

Almost surely, 2^1644364413 is an apocalyptic number.

It is an amenable number.

1644364413 is a deficient number, since it is larger than the sum of its proper divisors (730828641).

1644364413 is a wasteful number, since it uses less digits than its factorization.

1644364413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182707163 (or 182707160 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 1644364413 is about 40550.7634083503. The cubic root of 1644364413 is about 1180.3188865723.

Adding to 1644364413 its reverse (3144634461), we get a palindrome (4788998874).

The spelling of 1644364413 in words is "one billion, six hundred forty-four million, three hundred sixty-four thousand, four hundred thirteen".