680487587028649 has 9 divisors (see below), whose sum is σ = 680898979405533. Its totient is φ = 680076443108172.

The previous prime is 680487587028631. The next prime is 680487587028721. The reversal of 680487587028649 is 946820785784086.

The square root of 680487587028649 is 26086157.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 680487587028649 - 2¹³ = 680487587020457 is a prime.

It is a super-2 number, since 2×680487587028649² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680487587028629) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 49015882062 + ... + 49015895944.

Almost surely, 2^{680487587028649} is an apocalyptic number.

680487587028649 is the 26086157-th square number.

680487587028649 is the 13043079-th centered octagonal number.

It is an amenable number.

680487587028649 is a deficient number, since it is larger than the sum of its proper divisors (411392376884).

680487587028649 is an frugal number, since it uses more digits than its factorization.

680487587028649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31524 (or 15762 counting only the distinct ones).

The product of its (nonzero) digits is 10404495360, while the sum is 82.

The spelling of 680487587028649 in words is "six hundred eighty trillion, four hundred eighty-seven billion, five hundred eighty-seven million, twenty-eight thousand, six hundred forty-nine".