7842564517 has 2 divisors, whose sum is σ = 7842564518. Its totient is φ = 7842564516.

The previous prime is 7842564493. The next prime is 7842564529. The reversal of 7842564517 is 7154652487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4213827396 + 3628737121 = 64914^2 + 60239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7842564517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7842564577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3921282258 + 3921282259.

It is an arithmetic number, because the mean of its divisors is an integer number (3921282259).

Almost surely, 2^7842564517 is an apocalyptic number.

It is an amenable number.

7842564517 is a deficient number, since it is larger than the sum of its proper divisors (1).

7842564517 is an equidigital number, since it uses as much as digits as its factorization.

7842564517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1881600, while the sum is 49.

The square root of 7842564517 is about 88558.2549342522. The cubic root of 7842564517 is about 1986.7933607093.

The spelling of 7842564517 in words is "seven billion, eight hundred forty-two million, five hundred sixty-four thousand, five hundred seventeen".