7842873557 has 2 divisors, whose sum is σ = 7842873558. Its totient is φ = 7842873556.

The previous prime is 7842873491. The next prime is 7842873611. The reversal of 7842873557 is 7553782487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7779416401 + 63457156 = 88201^2 + 7966^2 .

It is a cyclic number.

It is not a de Polignac number, because 7842873557 - 2¹⁴ = 7842857173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7842873457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3921436778 + 3921436779.

It is an arithmetic number, because the mean of its divisors is an integer number (3921436779).

Almost surely, 2^7842873557 is an apocalyptic number.

It is an amenable number.

7842873557 is a deficient number, since it is larger than the sum of its proper divisors (1).

7842873557 is an equidigital number, since it uses as much as digits as its factorization.

7842873557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13171200, while the sum is 56.

The square root of 7842873557 is about 88559.9997572267. Note that the first 3 decimals coincide. The cubic root of 7842873557 is about 1986.8194572136.

The spelling of 7842873557 in words is "seven billion, eight hundred forty-two million, eight hundred seventy-three thousand, five hundred fifty-seven".