12555021553 has 2 divisors, whose sum is σ = 12555021554. Its totient is φ = 12555021552.

The previous prime is 12555021511. The next prime is 12555021587. The reversal of 12555021553 is 35512055521.

It is an a-pointer prime, because the next prime (12555021587) can be obtained adding 12555021553 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8067093489 + 4487928064 = 89817^2 + 66992^2 .

It is an emirp because it is prime and its reverse (35512055521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12555021553 is a prime.

It is not a weakly prime, because it can be changed into another prime (12555022553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277510776 + 6277510777.

It is an arithmetic number, because the mean of its divisors is an integer number (6277510777).

Almost surely, 2^12555021553 is an apocalyptic number.

It is an amenable number.

12555021553 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555021553 is an equidigital number, since it uses as much as digits as its factorization.

12555021553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 12555021553 in words is "twelve billion, five hundred fifty-five million, twenty-one thousand, five hundred fifty-three".