689693793449 has 4 divisors (see below), whose sum is σ = 689741076480. Its totient is φ = 689646510420.

The previous prime is 689693793427. The next prime is 689693793527. The reversal of 689693793449 is 944397396986.

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 a de Polignac number, because none of the positive numbers 2^k-689693793449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689693793449.

It is not an unprimeable number, because it can be changed into a prime (689693793419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23619629 + ... + 23648810.

It is an arithmetic number, because the mean of its divisors is an integer number (172435269120).

Almost surely, 2^689693793449 is an apocalyptic number.

It is an amenable number.

689693793449 is a deficient number, since it is larger than the sum of its proper divisors (47283031).

689693793449 is a wasteful number, since it uses less digits than its factorization.

689693793449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47283030.

The product of its digits is 1904684544, while the sum is 77.

The spelling of 689693793449 in words is "six hundred eighty-nine billion, six hundred ninety-three million, seven hundred ninety-three thousand, four hundred forty-nine".