689727985593 has 4 divisors (see below), whose sum is σ = 919637314128. Its totient is φ = 459818657060.

The previous prime is 689727985591. The next prime is 689727985627. The reversal of 689727985593 is 395589727986.

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 689727985593 - 2¹ = 689727985591 is a prime.

It is a super-2 number, since 2×689727985593² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (689727985591) 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, 114954664263 + ... + 114954664268.

It is an arithmetic number, because the mean of its divisors is an integer number (229909328532).

Almost surely, 2^689727985593 is an apocalyptic number.

It is an amenable number.

689727985593 is a deficient number, since it is larger than the sum of its proper divisors (229909328535).

689727985593 is a wasteful number, since it uses less digits than its factorization.

689727985593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229909328534.

The product of its digits is 2057529600, while the sum is 78.

The spelling of 689727985593 in words is "six hundred eighty-nine billion, seven hundred twenty-seven million, nine hundred eighty-five thousand, five hundred ninety-three".