6988256717 has 4 divisors (see below), whose sum is σ = 7525814940. Its totient is φ = 6450698496.

The previous prime is 6988256707. The next prime is 6988256729. The reversal of 6988256717 is 7176528896.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4284880681 + 2703376036 = 65459^2 + 51994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6988256717 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 (6988256707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268779092 + ... + 268779117.

It is an arithmetic number, because the mean of its divisors is an integer number (1881453735).

Almost surely, 2^6988256717 is an apocalyptic number.

It is an amenable number.

6988256717 is a deficient number, since it is larger than the sum of its proper divisors (537558223).

6988256717 is a wasteful number, since it uses less digits than its factorization.

6988256717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537558222.

The product of its digits is 10160640, while the sum is 59.

The square root of 6988256717 is about 83595.7936561404. The cubic root of 6988256717 is about 1911.8608653453.

The spelling of 6988256717 in words is "six billion, nine hundred eighty-eight million, two hundred fifty-six thousand, seven hundred seventeen".