1688068251 has 12 divisors (see below), whose sum is σ = 2465718840. Its totient is φ = 1112733600.

The previous prime is 1688068229. The next prime is 1688068259. The reversal of 1688068251 is 1528608861.

It is not a de Polignac number, because 1688068251 - 2⁹ = 1688067739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1688068197 and 1688068206.

It is not an unprimeable number, because it can be changed into a prime (1688068259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1052925 + ... + 1054526.

It is an arithmetic number, because the mean of its divisors is an integer number (205476570).

Almost surely, 2^1688068251 is an apocalyptic number.

1688068251 is a deficient number, since it is larger than the sum of its proper divisors (777650589).

1688068251 is a wasteful number, since it uses less digits than its factorization.

1688068251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107546 (or 2107543 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 1688068251 is about 41086.1077616267. The cubic root of 1688068251 is about 1190.6844098654.

The spelling of 1688068251 in words is "one billion, six hundred eighty-eight million, sixty-eight thousand, two hundred fifty-one".