1644564142650 has 192 divisors, whose sum is σ = 4793680434816. Its totient is φ = 367850496000.

The previous prime is 1644564142649. The next prime is 1644564142657. The reversal of 1644564142650 is 562414654461.

It is a self number, because there is not a number n which added to its sum of digits gives 1644564142650.

It is not an unprimeable number, because it can be changed into a prime (1644564142657) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 51828790 + ... + 51860510.

It is an arithmetic number, because the mean of its divisors is an integer number (24967085598).

Almost surely, 2^{1644564142650} is an apocalyptic number.

1644564142650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644564142650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2396840217408).

1644564142650 is an abundant number, since it is smaller than the sum of its proper divisors (3149116292166).

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

1644564142650 is a wasteful number, since it uses less digits than its factorization.

1644564142650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34177 (or 34172 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 48.

The spelling of 1644564142650 in words is "one trillion, six hundred forty-four billion, five hundred sixty-four million, one hundred forty-two thousand, six hundred fifty".