2001770988644 has 36 divisors (see below), whose sum is σ = 4185169862076. Its totient is φ = 834715312704.

The previous prime is 2001770988631. The next prime is 2001770988647. The reversal of 2001770988644 is 4468890771002.

It can be written as a sum of positive squares in 2 ways, for example, as 693492548644 + 1308278440000 = 832762^2 + 1143800^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2001770988644.

It is not an unprimeable number, because it can be changed into a prime (2001770988647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138007847 + ... + 138022350.

It is an arithmetic number, because the mean of its divisors is an integer number (116254718391).

Almost surely, 2^{2001770988644} is an apocalyptic number.

It is an amenable number.

2001770988644 is an abundant number, since it is smaller than the sum of its proper divisors (2183398873432).

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

2001770988644 is a wasteful number, since it uses less digits than its factorization.

2001770988644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276030252 (or 276030243 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 2001770988644 in words is "two trillion, one billion, seven hundred seventy million, nine hundred eighty-eight thousand, six hundred forty-four".