7643784061 has 2 divisors, whose sum is σ = 7643784062. Its totient is φ = 7643784060.

The previous prime is 7643784059. The next prime is 7643784121. The reversal of 7643784061 is 1604873467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4879022500 + 2764761561 = 69850^2 + 52581^2 .

It is an emirp because it is prime and its reverse (1604873467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7643784061 - 2¹ = 7643784059 is a prime.

Together with 7643784059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7643784961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821892030 + 3821892031.

It is an arithmetic number, because the mean of its divisors is an integer number (3821892031).

Almost surely, 2^7643784061 is an apocalyptic number.

It is an amenable number.

7643784061 is a deficient number, since it is larger than the sum of its proper divisors (1).

7643784061 is an equidigital number, since it uses as much as digits as its factorization.

7643784061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 46.

The square root of 7643784061 is about 87428.7370433772. The cubic root of 7643784061 is about 1969.8635154140.

The spelling of 7643784061 in words is "seven billion, six hundred forty-three million, seven hundred eighty-four thousand, sixty-one".