12555021511 has 2 divisors, whose sum is σ = 12555021512. Its totient is φ = 12555021510.

The previous prime is 12555021481. The next prime is 12555021553. The reversal of 12555021511 is 11512055521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12555021511 is a prime.

It is a super-4 number, since 4×12555021511⁴ (a number of 41 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12555021511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12555021211) 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, 6277510755 + 6277510756.

It is an arithmetic number, because the mean of its divisors is an integer number (6277510756).

Almost surely, 2^12555021511 is an apocalyptic number.

12555021511 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555021511 is an equidigital number, since it uses as much as digits as its factorization.

12555021511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2500, while the sum is 28.

The spelling of 12555021511 in words is "twelve billion, five hundred fifty-five million, twenty-one thousand, five hundred eleven".