7972816609 has 2 divisors, whose sum is σ = 7972816610. Its totient is φ = 7972816608.

The previous prime is 7972816589. The next prime is 7972816667. The reversal of 7972816609 is 9066182797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6479767009 + 1493049600 = 80497^2 + 38640^2 .

It is a cyclic number.

It is not a de Polignac number, because 7972816609 - 2²³ = 7964428001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7972816609.

It is not a weakly prime, because it can be changed into another prime (7972816109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3986408304 + 3986408305.

It is an arithmetic number, because the mean of its divisors is an integer number (3986408305).

Almost surely, 2^7972816609 is an apocalyptic number.

It is an amenable number.

7972816609 is a deficient number, since it is larger than the sum of its proper divisors (1).

7972816609 is an equidigital number, since it uses as much as digits as its factorization.

7972816609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The square root of 7972816609 is about 89290.6300179364. The cubic root of 7972816609 is about 1997.7321468096.

The spelling of 7972816609 in words is "seven billion, nine hundred seventy-two million, eight hundred sixteen thousand, six hundred nine".