687238317523 has 2 divisors, whose sum is σ = 687238317524. Its totient is φ = 687238317522.

The previous prime is 687238317517. The next prime is 687238317529. The reversal of 687238317523 is 325713832786.

It is a balanced prime because it is at equal distance from previous prime (687238317517) and next prime (687238317529).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687238317523 is a prime.

It is not a weakly prime, because it can be changed into another prime (687238317529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343619158761 + 343619158762.

It is an arithmetic number, because the mean of its divisors is an integer number (343619158762).

Almost surely, 2^687238317523 is an apocalyptic number.

687238317523 is a deficient number, since it is larger than the sum of its proper divisors (1).

687238317523 is an equidigital number, since it uses as much as digits as its factorization.

687238317523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 55.

The spelling of 687238317523 in words is "six hundred eighty-seven billion, two hundred thirty-eight million, three hundred seventeen thousand, five hundred twenty-three".