6620730731 has 2 divisors, whose sum is σ = 6620730732. Its totient is φ = 6620730730.

The previous prime is 6620730719. The next prime is 6620730793. The reversal of 6620730731 is 1370370266.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6620730731 - 2¹⁸ = 6620468587 is a prime.

It is a super-2 number, since 2×6620730731² = 87668150824815588722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 6620730691 and 6620730700.

It is not a weakly prime, because it can be changed into another prime (6620730931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310365365 + 3310365366.

It is an arithmetic number, because the mean of its divisors is an integer number (3310365366).

Almost surely, 2^6620730731 is an apocalyptic number.

6620730731 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620730731 is an equidigital number, since it uses as much as digits as its factorization.

6620730731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 6620730731 is about 81367.8728430331. The cubic root of 6620730731 is about 1877.7393540837.

The spelling of 6620730731 in words is "six billion, six hundred twenty million, seven hundred thirty thousand, seven hundred thirty-one".