687432240653 has 2 divisors, whose sum is σ = 687432240654. Its totient is φ = 687432240652.

The previous prime is 687432240629. The next prime is 687432240673. The reversal of 687432240653 is 356042234786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614660704009 + 72771536644 = 784003^2 + 269762^2 .

It is a cyclic number.

It is not a de Polignac number, because 687432240653 - 2⁶ = 687432240589 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687432240673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343716120326 + 343716120327.

It is an arithmetic number, because the mean of its divisors is an integer number (343716120327).

Almost surely, 2^687432240653 is an apocalyptic number.

It is an amenable number.

687432240653 is a deficient number, since it is larger than the sum of its proper divisors (1).

687432240653 is an equidigital number, since it uses as much as digits as its factorization.

687432240653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 50.

The spelling of 687432240653 in words is "six hundred eighty-seven billion, four hundred thirty-two million, two hundred forty thousand, six hundred fifty-three".