688184607421 has 4 divisors (see below), whose sum is σ = 688463565952. Its totient is φ = 687905648892.

The previous prime is 688184607413. The next prime is 688184607463. The reversal of 688184607421 is 124706481886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 688184607421 - 2³ = 688184607413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688284607421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139475565 + ... + 139480498.

It is an arithmetic number, because the mean of its divisors is an integer number (172115891488).

Almost surely, 2^688184607421 is an apocalyptic number.

It is an amenable number.

688184607421 is a deficient number, since it is larger than the sum of its proper divisors (278958531).

688184607421 is a wasteful number, since it uses less digits than its factorization.

688184607421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278958530.

The product of its (nonzero) digits is 4128768, while the sum is 55.

The spelling of 688184607421 in words is "six hundred eighty-eight billion, one hundred eighty-four million, six hundred seven thousand, four hundred twenty-one".