6998489661 has 16 divisors (see below), whose sum is σ = 9634972160. Its totient is φ = 4513916160.

The previous prime is 6998489609. The next prime is 6998489689. The reversal of 6998489661 is 1669848996.

It is a happy number.

It is not a de Polignac number, because 6998489661 - 2⁹ = 6998489149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6998489592 and 6998489601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6998489461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431841 + ... + 447753.

It is an arithmetic number, because the mean of its divisors is an integer number (602185760).

Almost surely, 2^6998489661 is an apocalyptic number.

It is an amenable number.

6998489661 is a deficient number, since it is larger than the sum of its proper divisors (2636482499).

6998489661 is a wasteful number, since it uses less digits than its factorization.

6998489661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20676.

The product of its digits is 40310784, while the sum is 66.

The square root of 6998489661 is about 83656.9761645734. The cubic root of 6998489661 is about 1912.7935931349.

The spelling of 6998489661 in words is "six billion, nine hundred ninety-eight million, four hundred eighty-nine thousand, six hundred sixty-one".