689779768461 has 8 divisors (see below), whose sum is σ = 1051092980544. Its totient is φ = 394159867680.

The previous prime is 689779768429. The next prime is 689779768549. The reversal of 689779768461 is 164867977986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 689779768461 - 2⁵ = 689779768429 is a prime.

It is a super-2 number, since 2×689779768461² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689779768421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16423327800 + ... + 16423327841.

It is an arithmetic number, because the mean of its divisors is an integer number (131386622568).

Almost surely, 2^689779768461 is an apocalyptic number.

It is an amenable number.

689779768461 is a deficient number, since it is larger than the sum of its proper divisors (361313212083).

689779768461 is a wasteful number, since it uses less digits than its factorization.

689779768461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32846655651.

The product of its digits is 1536288768, while the sum is 78.

The spelling of 689779768461 in words is "six hundred eighty-nine billion, seven hundred seventy-nine million, seven hundred sixty-eight thousand, four hundred sixty-one".