7245143645521 has 2 divisors, whose sum is σ = 7245143645522. Its totient is φ = 7245143645520.

The previous prime is 7245143645473. The next prime is 7245143645527. The reversal of 7245143645521 is 1255463415427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6825213725121 + 419929920400 = 2612511^2 + 648020^2 .

It is a cyclic number.

It is not a de Polignac number, because 7245143645521 - 2²³ = 7245135256913 is a prime.

It is a super-3 number, since 3×7245143645521³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (7245143645527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3622571822760 + 3622571822761.

It is an arithmetic number, because the mean of its divisors is an integer number (3622571822761).

Almost surely, 2^{7245143645521} is an apocalyptic number.

It is an amenable number.

7245143645521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7245143645521 is an equidigital number, since it uses as much as digits as its factorization.

7245143645521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032000, while the sum is 49.

The spelling of 7245143645521 in words is "seven trillion, two hundred forty-five billion, one hundred forty-three million, six hundred forty-five thousand, five hundred twenty-one".