1825357321609 has 2 divisors, whose sum is σ = 1825357321610. Its totient is φ = 1825357321608.

The previous prime is 1825357321589. The next prime is 1825357321631. The reversal of 1825357321609 is 9061237535281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1258596784384 + 566760537225 = 1121872^2 + 752835^2 .

It is a cyclic number.

It is not a de Polignac number, because 1825357321609 - 2¹¹ = 1825357319561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1825357322609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 912678660804 + 912678660805.

It is an arithmetic number, because the mean of its divisors is an integer number (912678660805).

Almost surely, 2^{1825357321609} is an apocalyptic number.

It is an amenable number.

1825357321609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1825357321609 is an equidigital number, since it uses as much as digits as its factorization.

1825357321609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 1825357321609 in words is "one trillion, eight hundred twenty-five billion, three hundred fifty-seven million, three hundred twenty-one thousand, six hundred nine".