1644052618 has 12 divisors (see below), whose sum is σ = 2670370038. Its totient is φ = 758793360.

The previous prime is 1644052607. The next prime is 1644052639. The reversal of 1644052618 is 8162504461.

It can be written as a sum of positive squares in 3 ways, for example, as 619860609 + 1024192009 = 24897^2 + 32003^2 .

It is a super-3 number, since 3×1644052618³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2431693 + ... + 2432368.

Almost surely, 2^1644052618 is an apocalyptic number.

1644052618 is a deficient number, since it is larger than the sum of its proper divisors (1026317420).

1644052618 is a wasteful number, since it uses less digits than its factorization.

1644052618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4864089 (or 4864076 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1644052618 is about 40546.9187238685. The cubic root of 1644052618 is about 1180.2442800785.

The spelling of 1644052618 in words is "one billion, six hundred forty-four million, fifty-two thousand, six hundred eighteen".