4512636728521 has 2 divisors, whose sum is σ = 4512636728522. Its totient is φ = 4512636728520.

The previous prime is 4512636728437. The next prime is 4512636728527. The reversal of 4512636728521 is 1258276362154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3630305272896 + 882331455625 = 1905336^2 + 939325^2 .

It is a cyclic number.

It is not a de Polignac number, because 4512636728521 - 2¹⁵ = 4512636695753 is a prime.

It is not a weakly prime, because it can be changed into another prime (4512636728527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2256318364260 + 2256318364261.

It is an arithmetic number, because the mean of its divisors is an integer number (2256318364261).

Almost surely, 2^{4512636728521} is an apocalyptic number.

It is an amenable number.

4512636728521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4512636728521 is an equidigital number, since it uses as much as digits as its factorization.

4512636728521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 52.

The spelling of 4512636728521 in words is "four trillion, five hundred twelve billion, six hundred thirty-six million, seven hundred twenty-eight thousand, five hundred twenty-one".