1680787525009 has 2 divisors, whose sum is σ = 1680787525010. Its totient is φ = 1680787525008.

The previous prime is 1680787524991. The next prime is 1680787525111. The reversal of 1680787525009 is 9005257870861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1606873140625 + 73914384384 = 1267625^2 + 271872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680787525009 - 2¹¹ = 1680787522961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1680787505009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840393762504 + 840393762505.

It is an arithmetic number, because the mean of its divisors is an integer number (840393762505).

Almost surely, 2^{1680787525009} is an apocalyptic number.

It is an amenable number.

1680787525009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680787525009 is an equidigital number, since it uses as much as digits as its factorization.

1680787525009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 58.

The spelling of 1680787525009 in words is "one trillion, six hundred eighty billion, seven hundred eighty-seven million, five hundred twenty-five thousand, nine".