12555021481 has 2 divisors, whose sum is σ = 12555021482. Its totient is φ = 12555021480.

The previous prime is 12555021469. The next prime is 12555021511. The reversal of 12555021481 is 18412055521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11232608256 + 1322413225 = 105984^2 + 36365^2 .

It is a cyclic number.

It is not a de Polignac number, because 12555021481 - 2¹⁷ = 12554890409 is a prime.

It is a super-2 number, since 2×12555021481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12555024481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277510740 + 6277510741.

It is an arithmetic number, because the mean of its divisors is an integer number (6277510741).

Almost surely, 2^12555021481 is an apocalyptic number.

It is an amenable number.

12555021481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555021481 is an equidigital number, since it uses as much as digits as its factorization.

12555021481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 34.

The spelling of 12555021481 in words is "twelve billion, five hundred fifty-five million, twenty-one thousand, four hundred eighty-one".