688905608647 has 2 divisors, whose sum is σ = 688905608648. Its totient is φ = 688905608646.

The previous prime is 688905608603. The next prime is 688905608659. The reversal of 688905608647 is 746806509886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688905608647 - 2¹⁵ = 688905575879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688905608047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344452804323 + 344452804324.

It is an arithmetic number, because the mean of its divisors is an integer number (344452804324).

Almost surely, 2^688905608647 is an apocalyptic number.

688905608647 is a deficient number, since it is larger than the sum of its proper divisors (1).

688905608647 is an equidigital number, since it uses as much as digits as its factorization.

688905608647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139345920, while the sum is 67.

The spelling of 688905608647 in words is "six hundred eighty-eight billion, nine hundred five million, six hundred eight thousand, six hundred forty-seven".