7485945581 has 2 divisors, whose sum is σ = 7485945582. Its totient is φ = 7485945580.

The previous prime is 7485945569. The next prime is 7485945617. The reversal of 7485945581 is 1855495847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4628080900 + 2857864681 = 68030^2 + 53459^2 .

It is a cyclic number.

It is not a de Polignac number, because 7485945581 - 2¹⁸ = 7485683437 is a prime.

It is a super-2 number, since 2×7485945581² (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 (7485945281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3742972790 + 3742972791.

It is an arithmetic number, because the mean of its divisors is an integer number (3742972791).

Almost surely, 2^7485945581 is an apocalyptic number.

It is an amenable number.

7485945581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7485945581 is an equidigital number, since it uses as much as digits as its factorization.

7485945581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064000, while the sum is 56.

The square root of 7485945581 is about 86521.3591028250. The cubic root of 7485945581 is about 1956.2103629296.

The spelling of 7485945581 in words is "seven billion, four hundred eighty-five million, nine hundred forty-five thousand, five hundred eighty-one".