689690795798 has 4 divisors (see below), whose sum is σ = 1034536193700. Its totient is φ = 344845397898.

The previous prime is 689690795747. The next prime is 689690795851. The reversal of 689690795798 is 897597096986.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172422698948 + ... + 172422698951.

It is an arithmetic number, because the mean of its divisors is an integer number (258634048425).

Almost surely, 2^689690795798 is an apocalyptic number.

689690795798 is a deficient number, since it is larger than the sum of its proper divisors (344845397902).

689690795798 is a wasteful number, since it uses less digits than its factorization.

689690795798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344845397901.

The product of its (nonzero) digits is 3703553280, while the sum is 83.

The spelling of 689690795798 in words is "six hundred eighty-nine billion, six hundred ninety million, seven hundred ninety-five thousand, seven hundred ninety-eight".