6689470861 has 8 divisors (see below), whose sum is σ = 6923208600. Its totient is φ = 6455937600.

The previous prime is 6689470831. The next prime is 6689470867. The reversal of 6689470861 is 1680749866.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4093568361 + 2595902500 = 63981^2 + 50950^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6689470861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689470867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17011 + ... + 116911.

It is an arithmetic number, because the mean of its divisors is an integer number (865401075).

Almost surely, 2^6689470861 is an apocalyptic number.

It is an amenable number.

6689470861 is a deficient number, since it is larger than the sum of its proper divisors (233737739).

6689470861 is a wasteful number, since it uses less digits than its factorization.

6689470861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102239.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 6689470861 is about 81789.1854770544. The cubic root of 6689470861 is about 1884.2155724082.

The spelling of 6689470861 in words is "six billion, six hundred eighty-nine million, four hundred seventy thousand, eight hundred sixty-one".