7430138649581 has 2 divisors, whose sum is σ = 7430138649582. Its totient is φ = 7430138649580.

The previous prime is 7430138649487. The next prime is 7430138649643. The reversal of 7430138649581 is 1859468310347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6563254753225 + 866883896356 = 2561885^2 + 931066^2 .

It is an emirp because it is prime and its reverse (1859468310347) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7430138649581 is a prime.

It is a super-2 number, since 2×7430138649581² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7430138649581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7430138649181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3715069324790 + 3715069324791.

It is an arithmetic number, because the mean of its divisors is an integer number (3715069324791).

Almost surely, 2^{7430138649581} is an apocalyptic number.

It is an amenable number.

7430138649581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7430138649581 is an equidigital number, since it uses as much as digits as its factorization.

7430138649581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 7430138649581 in words is "seven trillion, four hundred thirty billion, one hundred thirty-eight million, six hundred forty-nine thousand, five hundred eighty-one".