1555200000128 has 32 divisors (see below), whose sum is σ = 3101308748460. Its totient is φ = 776832314368.

The previous prime is 1555200000089. The next prime is 1555200000131. The reversal of 1555200000128 is 8210000025551.

It can be written as a sum of positive squares in 2 ways, for example, as 1488185287744 + 67014712384 = 1219912^2 + 258872^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1555200000128.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5867375 + ... + 6126702.

Almost surely, 2^{1555200000128} is an apocalyptic number.

It is an amenable number.

1555200000128 is a deficient number, since it is larger than the sum of its proper divisors (1546108748332).

1555200000128 is a wasteful number, since it uses less digits than its factorization.

1555200000128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11995104 (or 11995092 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 1555200000128 its reverse (8210000025551), we get a palindrome (9765200025679).

The spelling of 1555200000128 in words is "one trillion, five hundred fifty-five billion, two hundred million, one hundred twenty-eight", and thus it is an aban number.