688993070455 has 4 divisors (see below), whose sum is σ = 826791684552. Its totient is φ = 551194456360.

The previous prime is 688993070443. The next prime is 688993070459. The reversal of 688993070455 is 554070399886.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 688993070455 - 2²⁵ = 688959516023 is a prime.

It is a super-3 number, since 3×688993070455³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688993070459) 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, 68899307041 + ... + 68899307050.

It is an arithmetic number, because the mean of its divisors is an integer number (206697921138).

Almost surely, 2^688993070455 is an apocalyptic number.

688993070455 is a deficient number, since it is larger than the sum of its proper divisors (137798614097).

688993070455 is a wasteful number, since it uses less digits than its factorization.

688993070455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137798614096.

The product of its (nonzero) digits is 65318400, while the sum is 64.

The spelling of 688993070455 in words is "six hundred eighty-eight billion, nine hundred ninety-three million, seventy thousand, four hundred fifty-five".