1989237544660 has 24 divisors (see below), whose sum is σ = 4181895544680. Its totient is φ = 794838503424.

The previous prime is 1989237544649. The next prime is 1989237544661. The reversal of 1989237544660 is 664457329891.

It can be written as a sum of positive squares in 4 ways, for example, as 226625506704 + 1762612037956 = 476052^2 + 1327634^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1989237544592 and 1989237544601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989237544661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53513109 + ... + 53550268.

It is an arithmetic number, because the mean of its divisors is an integer number (174245647695).

It is a 1-persistent number, because it is pandigital, but 2⋅1989237544660 = 3978475089320 is not.

Almost surely, 2^{1989237544660} is an apocalyptic number.

1989237544660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989237544660 is an abundant number, since it is smaller than the sum of its proper divisors (2192658000020).

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

1989237544660 is a wasteful number, since it uses less digits than its factorization.

1989237544660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107064315 (or 107064313 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 1989237544660 in words is "one trillion, nine hundred eighty-nine billion, two hundred thirty-seven million, five hundred forty-four thousand, six hundred sixty".