7643709509 has 2 divisors, whose sum is σ = 7643709510. Its totient is φ = 7643709508.

The previous prime is 7643709467. The next prime is 7643709523. The reversal of 7643709509 is 9059073467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7456840609 + 186868900 = 86353^2 + 13670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7643709509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7643709109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821854754 + 3821854755.

It is an arithmetic number, because the mean of its divisors is an integer number (3821854755).

Almost surely, 2^7643709509 is an apocalyptic number.

It is an amenable number.

7643709509 is a deficient number, since it is larger than the sum of its proper divisors (1).

7643709509 is an equidigital number, since it uses as much as digits as its factorization.

7643709509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 50.

The square root of 7643709509 is about 87428.3106836681. The cubic root of 7643709509 is about 1969.8571111802.

The spelling of 7643709509 in words is "seven billion, six hundred forty-three million, seven hundred nine thousand, five hundred nine".