6988817261 has 4 divisors (see below), whose sum is σ = 7177704252. Its totient is φ = 6799930272.

The previous prime is 6988817257. The next prime is 6988817263. The reversal of 6988817261 is 1627188896.

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 5756105161 + 1232712100 = 75869^2 + 35110^2 .

It is a cyclic number.

It is not a de Polignac number, because 6988817261 - 2² = 6988817257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6988817197 and 6988817206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6988817263) 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, 94443440 + ... + 94443513.

It is an arithmetic number, because the mean of its divisors is an integer number (1794426063).

Almost surely, 2^6988817261 is an apocalyptic number.

It is an amenable number.

6988817261 is a deficient number, since it is larger than the sum of its proper divisors (188886991).

6988817261 is a wasteful number, since it uses less digits than its factorization.

6988817261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188886990.

The product of its digits is 2322432, while the sum is 56.

The square root of 6988817261 is about 83599.1462934879. The cubic root of 6988817261 is about 1911.9119822179.

The spelling of 6988817261 in words is "six billion, nine hundred eighty-eight million, eight hundred seventeen thousand, two hundred sixty-one".