1200555116660 has 24 divisors (see below), whose sum is σ = 2527646907240. Its totient is φ = 478987539584.

The previous prime is 1200555116659. The next prime is 1200555116693. The reversal of 1200555116660 is 666115550021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 185027301904 + 1015527814756 = 430148^2 + 1007734^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77148719 + ... + 77164278.

It is an arithmetic number, because the mean of its divisors is an integer number (105318621135).

Almost surely, 2^{1200555116660} is an apocalyptic number.

1200555116660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200555116660 is an abundant number, since it is smaller than the sum of its proper divisors (1327091790580).

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

1200555116660 is a wasteful number, since it uses less digits than its factorization.

1200555116660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154313395 (or 154313393 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 1200555116660 in words is "one trillion, two hundred billion, five hundred fifty-five million, one hundred sixteen thousand, six hundred sixty".