1644345504652 has 48 divisors (see below), whose sum is σ = 3142654744320. Its totient is φ = 749664294912.

The previous prime is 1644345504553. The next prime is 1644345504667. The reversal of 1644345504652 is 2564055434461.

It is a super-3 number, since 3×1644345504652³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1644345504596 and 1644345504605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 816252 + ... + 1988707.

It is an arithmetic number, because the mean of its divisors is an integer number (65471973840).

Almost surely, 2^{1644345504652} is an apocalyptic number.

It is an amenable number.

1644345504652 is a deficient number, since it is larger than the sum of its proper divisors (1498309239668).

1644345504652 is a wasteful number, since it uses less digits than its factorization.

1644345504652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805250 (or 2805248 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 49.

The spelling of 1644345504652 in words is "one trillion, six hundred forty-four billion, three hundred forty-five million, five hundred four thousand, six hundred fifty-two".