685137844487 has 2 divisors, whose sum is σ = 685137844488. Its totient is φ = 685137844486.

The previous prime is 685137844481. The next prime is 685137844537. The reversal of 685137844487 is 784448731586.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685137844487 - 2⁴ = 685137844471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685137844481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342568922243 + 342568922244.

It is an arithmetic number, because the mean of its divisors is an integer number (342568922244).

Almost surely, 2^685137844487 is an apocalyptic number.

685137844487 is a deficient number, since it is larger than the sum of its proper divisors (1).

685137844487 is an equidigital number, since it uses as much as digits as its factorization.

685137844487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144506880, while the sum is 65.

The spelling of 685137844487 in words is "six hundred eighty-five billion, one hundred thirty-seven million, eight hundred forty-four thousand, four hundred eighty-seven".