688757112021 has 8 divisors (see below), whose sum is σ = 1001828526624. Its totient is φ = 417428552720.

The previous prime is 688757112011. The next prime is 688757112079. The reversal of 688757112021 is 120211757886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 688757112021 - 2⁶ = 688757111957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688757112011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10435713786 + ... + 10435713851.

It is an arithmetic number, because the mean of its divisors is an integer number (125228565828).

Almost surely, 2^688757112021 is an apocalyptic number.

It is an amenable number.

688757112021 is a deficient number, since it is larger than the sum of its proper divisors (313071414603).

688757112021 is a wasteful number, since it uses less digits than its factorization.

688757112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20871427651.

The product of its (nonzero) digits is 376320, while the sum is 48.

The spelling of 688757112021 in words is "six hundred eighty-eight billion, seven hundred fifty-seven million, one hundred twelve thousand, twenty-one".