688868030161 has 4 divisors (see below), whose sum is σ = 729389679012. Its totient is φ = 648346381312.

The previous prime is 688868030141. The next prime is 688868030167. The reversal of 688868030161 is 161030868886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161030868886 = 2 ⋅80515434443.

It can be written as a sum of positive squares in 2 ways, for example, as 212138542225 + 476729487936 = 460585^2 + 690456^2 .

It is a cyclic number.

It is not a de Polignac number, because 688868030161 - 2⁹ = 688868029649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688868030167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20260824400 + ... + 20260824433.

It is an arithmetic number, because the mean of its divisors is an integer number (182347419753).

Almost surely, 2^688868030161 is an apocalyptic number.

It is an amenable number.

688868030161 is a deficient number, since it is larger than the sum of its proper divisors (40521648851).

688868030161 is a wasteful number, since it uses less digits than its factorization.

688868030161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40521648850.

The product of its (nonzero) digits is 2654208, while the sum is 55.

The spelling of 688868030161 in words is "six hundred eighty-eight billion, eight hundred sixty-eight million, thirty thousand, one hundred sixty-one".