1644055515056 has 20 divisors (see below), whose sum is σ = 3185377503000. Its totient is φ = 822022611072.

The previous prime is 1644055515049. The next prime is 1644055515079. The reversal of 1644055515056 is 6505155504461.

It is a super-3 number, since 3×1644055515056³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1644055515056.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4546655 + ... + 4894913.

It is an arithmetic number, because the mean of its divisors is an integer number (159268875150).

Almost surely, 2^{1644055515056} is an apocalyptic number.

1644055515056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1644055515056 is a deficient number, since it is larger than the sum of its proper divisors (1541321987944).

1644055515056 is a wasteful number, since it uses less digits than its factorization.

1644055515056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643316 (or 643310 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 47.

The spelling of 1644055515056 in words is "one trillion, six hundred forty-four billion, fifty-five million, five hundred fifteen thousand, fifty-six".