689772452449 has 4 divisors (see below), whose sum is σ = 713557709460. Its totient is φ = 665987195440.

The previous prime is 689772452443. The next prime is 689772452569. The reversal of 689772452449 is 944254277986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 557422012449 + 132350440000 = 746607^2 + 363800^2 .

It is a cyclic number.

It is not a de Polignac number, because 689772452449 - 2³ = 689772452441 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689772452441) 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, 11892628462 + ... + 11892628519.

It is an arithmetic number, because the mean of its divisors is an integer number (178389427365).

Almost surely, 2^689772452449 is an apocalyptic number.

It is an amenable number.

689772452449 is a deficient number, since it is larger than the sum of its proper divisors (23785257011).

689772452449 is a wasteful number, since it uses less digits than its factorization.

689772452449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23785257010.

The product of its digits is 243855360, while the sum is 67.

The spelling of 689772452449 in words is "six hundred eighty-nine billion, seven hundred seventy-two million, four hundred fifty-two thousand, four hundred forty-nine".