6998800509 has 6 divisors (see below), whose sum is σ = 10109378526. Its totient is φ = 4665867000.

The previous prime is 6998800493. The next prime is 6998800541. The reversal of 6998800509 is 9050088996.

It can be written as a sum of positive squares in only one way, i.e., 6525085284 + 473715225 = 80778^2 + 21765^2 .

It is not a de Polignac number, because 6998800509 - 2⁴ = 6998800493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6998600509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 388822242 + ... + 388822259.

It is an arithmetic number, because the mean of its divisors is an integer number (1684896421).

Almost surely, 2^6998800509 is an apocalyptic number.

It is an amenable number.

6998800509 is a deficient number, since it is larger than the sum of its proper divisors (3110578017).

6998800509 is a wasteful number, since it uses less digits than its factorization.

6998800509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777644507 (or 777644504 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The square root of 6998800509 is about 83658.8340164982. The cubic root of 6998800509 is about 1912.8219125433.

The spelling of 6998800509 in words is "six billion, nine hundred ninety-eight million, eight hundred thousand, five hundred nine".