1680897625609 has 4 divisors (see below), whose sum is σ = 1726327291204. Its totient is φ = 1635467960016.

The previous prime is 1680897625489. The next prime is 1680897625613. The reversal of 1680897625609 is 9065267980861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1621476250384 + 59421375225 = 1273372^2 + 243765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680897625609 - 2⁷ = 1680897625481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680897625109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22714832742 + ... + 22714832815.

It is an arithmetic number, because the mean of its divisors is an integer number (431581822801).

Almost surely, 2^{1680897625609} is an apocalyptic number.

It is an amenable number.

1680897625609 is a deficient number, since it is larger than the sum of its proper divisors (45429665595).

1680897625609 is an equidigital number, since it uses as much as digits as its factorization.

1680897625609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45429665594.

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 1680897625609 in words is "one trillion, six hundred eighty billion, eight hundred ninety-seven million, six hundred twenty-five thousand, six hundred nine".