6747417821 has 2 divisors, whose sum is σ = 6747417822. Its totient is φ = 6747417820.

The previous prime is 6747417797. The next prime is 6747417823. The reversal of 6747417821 is 1287147476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4506436900 + 2240980921 = 67130^2 + 47339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6747417821 is a prime.

It is a super-2 number, since 2×6747417821² = 91055294502296776082, which contains 22 as substring.

Together with 6747417823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6747417823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3373708910 + 3373708911.

It is an arithmetic number, because the mean of its divisors is an integer number (3373708911).

Almost surely, 2^6747417821 is an apocalyptic number.

It is an amenable number.

6747417821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6747417821 is an equidigital number, since it uses as much as digits as its factorization.

6747417821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 47.

The square root of 6747417821 is about 82142.6674816444. The cubic root of 6747417821 is about 1889.6405558338.

The spelling of 6747417821 in words is "six billion, seven hundred forty-seven million, four hundred seventeen thousand, eight hundred twenty-one".