688107141621 has 6 divisors (see below), whose sum is σ = 993932537910. Its totient is φ = 458738094408.

The previous prime is 688107141583. The next prime is 688107141643. The reversal of 688107141621 is 126141701886.

688107141621 is a `hidden beast` number, since 6 + 8 + 8 + 1 + 0 + 7 + 14 + 1 + 621 = 666.

688107141621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 534011639121 + 154095502500 = 730761^2 + 392550^2 .

It is not a de Polignac number, because 688107141621 - 2¹⁵ = 688107108853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688107141661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38228174526 + ... + 38228174543.

It is an arithmetic number, because the mean of its divisors is an integer number (165655422985).

Almost surely, 2^688107141621 is an apocalyptic number.

It is an amenable number.

688107141621 is a deficient number, since it is larger than the sum of its proper divisors (305825396289).

688107141621 is a wasteful number, since it uses less digits than its factorization.

688107141621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76456349075 (or 76456349072 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 688107141621 in words is "six hundred eighty-eight billion, one hundred seven million, one hundred forty-one thousand, six hundred twenty-one".