20012530187609 has 2 divisors, whose sum is σ = 20012530187610. Its totient is φ = 20012530187608.

The previous prime is 20012530187603. The next prime is 20012530187693. The reversal of 20012530187609 is 90678103521002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11845966589209 + 8166563598400 = 3441797^2 + 2857720^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012530187609 - 2³² = 20008235220313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012530187609.

It is not a weakly prime, because it can be changed into another prime (20012530187603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006265093804 + 10006265093805.

It is an arithmetic number, because the mean of its divisors is an integer number (10006265093805).

Almost surely, 2^{20012530187609} is an apocalyptic number.

It is an amenable number.

20012530187609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012530187609 is an equidigital number, since it uses as much as digits as its factorization.

20012530187609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 20012530187609 in words is "twenty trillion, twelve billion, five hundred thirty million, one hundred eighty-seven thousand, six hundred nine".