7455516581 has 2 divisors, whose sum is σ = 7455516582. Its totient is φ = 7455516580.

The previous prime is 7455516569. The next prime is 7455516637. The reversal of 7455516581 is 1856155547.

7455516581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6587919556 + 867597025 = 81166^2 + 29455^2 .

It is a cyclic number.

It is not a de Polignac number, because 7455516581 - 2¹⁴ = 7455500197 is a prime.

It is a super-2 number, since 2×7455516581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7455516181) 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, 3727758290 + 3727758291.

It is an arithmetic number, because the mean of its divisors is an integer number (3727758291).

Almost surely, 2^7455516581 is an apocalyptic number.

It is an amenable number.

7455516581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7455516581 is an equidigital number, since it uses as much as digits as its factorization.

7455516581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840000, while the sum is 47.

The square root of 7455516581 is about 86345.3332902248. Note that the first 3 decimals coincide. The cubic root of 7455516581 is about 1953.5562176572.

The spelling of 7455516581 in words is "seven billion, four hundred fifty-five million, five hundred sixteen thousand, five hundred eighty-one".