1644245621334 has 48 divisors (see below), whose sum is σ = 3718134811872. Its totient is φ = 524152109184.

The previous prime is 1644245621329. The next prime is 1644245621453. The reversal of 1644245621334 is 4331265424461.

1644245621334 is a `hidden beast` number, since 1 + 6 + 4 + 42 + 4 + 562 + 13 + 34 = 666.

It is a super-3 number, since 3×1644245621334³ (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 1644245621334.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1806424 + ... + 2559620.

It is an arithmetic number, because the mean of its divisors is an integer number (77461141914).

Almost surely, 2^{1644245621334} is an apocalyptic number.

1644245621334 is an abundant number, since it is smaller than the sum of its proper divisors (2073889190538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1644245621334 is a wasteful number, since it uses less digits than its factorization.

1644245621334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758501 (or 758498 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 45.

The spelling of 1644245621334 in words is "one trillion, six hundred forty-four billion, two hundred forty-five million, six hundred twenty-one thousand, three hundred thirty-four".