7548638681 has 2 divisors, whose sum is σ = 7548638682. Its totient is φ = 7548638680.

The previous prime is 7548638659. The next prime is 7548638689. The reversal of 7548638681 is 1868368457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4388400025 + 3160238656 = 66245^2 + 56216^2 .

It is an emirp because it is prime and its reverse (1868368457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7548638681 - 2¹⁴ = 7548622297 is a prime.

It is a super-2 number, since 2×7548638681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7548638689) 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, 3774319340 + 3774319341.

It is an arithmetic number, because the mean of its divisors is an integer number (3774319341).

Almost surely, 2^7548638681 is an apocalyptic number.

It is an amenable number.

7548638681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7548638681 is an equidigital number, since it uses as much as digits as its factorization.

7548638681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7741440, while the sum is 56.

The square root of 7548638681 is about 86882.9021211884. The cubic root of 7548638681 is about 1961.6561284379.

The spelling of 7548638681 in words is "seven billion, five hundred forty-eight million, six hundred thirty-eight thousand, six hundred eighty-one".