6730117781 has 6 divisors (see below), whose sum is σ = 6890273910. Its totient is φ = 6573601608.

The previous prime is 6730117769. The next prime is 6730117843. The reversal of 6730117781 is 1877110376.

It can be written as a sum of positive squares in only one way, i.e., 3557048881 + 3173068900 = 59641^2 + 56330^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6730117781 is a prime.

It is a super-2 number, since 2×6730117781² = 90588970692264727922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6730117721) 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, 1818086 + ... + 1821783.

It is an arithmetic number, because the mean of its divisors is an integer number (1148378985).

Almost surely, 2^6730117781 is an apocalyptic number.

It is an amenable number.

6730117781 is a deficient number, since it is larger than the sum of its proper divisors (160156129).

6730117781 is an equidigital number, since it uses as much as digits as its factorization.

6730117781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639955 (or 3639912 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 6730117781 is about 82037.2950614536. The cubic root of 6730117781 is about 1888.0241924993.

The spelling of 6730117781 in words is "six billion, seven hundred thirty million, one hundred seventeen thousand, seven hundred eighty-one".