1539521358673 has 2 divisors, whose sum is σ = 1539521358674. Its totient is φ = 1539521358672.

The previous prime is 1539521358637. The next prime is 1539521358761. The reversal of 1539521358673 is 3768531259351.

It is a happy number.

Together with previous prime (1539521358637) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1328929395264 + 210591963409 = 1152792^2 + 458903^2 .

It is a cyclic number.

It is not a de Polignac number, because 1539521358673 - 2³⁷ = 1402082405201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1539521358373) 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, 769760679336 + 769760679337.

It is an arithmetic number, because the mean of its divisors is an integer number (769760679337).

Almost surely, 2^{1539521358673} is an apocalyptic number.

It is an amenable number.

1539521358673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1539521358673 is an equidigital number, since it uses as much as digits as its factorization.

1539521358673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412000, while the sum is 58.

The spelling of 1539521358673 in words is "one trillion, five hundred thirty-nine billion, five hundred twenty-one million, three hundred fifty-eight thousand, six hundred seventy-three".