6689455761 has 8 divisors (see below), whose sum is σ = 9388709920. Its totient is φ = 4224919392.

The previous prime is 6689455757. The next prime is 6689455793. The reversal of 6689455761 is 1675549866.

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

It is not a de Polignac number, because 6689455761 - 2² = 6689455757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57), and also a Moran number because the ratio is a prime number: 117358873 = 6689455761 / (6 + 6 + 8 + 9 + 4 + 5 + 5 + 7 + 6 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6689455061) 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, 58679380 + ... + 58679493.

It is an arithmetic number, because the mean of its divisors is an integer number (1173588740).

Almost surely, 2^6689455761 is an apocalyptic number.

It is an amenable number.

6689455761 is a deficient number, since it is larger than the sum of its proper divisors (2699254159).

6689455761 is a wasteful number, since it uses less digits than its factorization.

6689455761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117358895.

The product of its digits is 10886400, while the sum is 57.

The square root of 6689455761 is about 81789.0931665097. The cubic root of 6689455761 is about 1884.2141546739.

The spelling of 6689455761 in words is "six billion, six hundred eighty-nine million, four hundred fifty-five thousand, seven hundred sixty-one".