7478726016521 has 2 divisors, whose sum is σ = 7478726016522. Its totient is φ = 7478726016520.

The previous prime is 7478726016457. The next prime is 7478726016569. The reversal of 7478726016521 is 1256106278747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7449973727296 + 28752289225 = 2729464^2 + 169565^2 .

It is a cyclic number.

It is not a de Polignac number, because 7478726016521 - 2⁶ = 7478726016457 is a prime.

It is not a weakly prime, because it can be changed into another prime (7478726010521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3739363008260 + 3739363008261.

It is an arithmetic number, because the mean of its divisors is an integer number (3739363008261).

Almost surely, 2^{7478726016521} is an apocalyptic number.

It is an amenable number.

7478726016521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7478726016521 is an equidigital number, since it uses as much as digits as its factorization.

7478726016521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7902720, while the sum is 56.

The spelling of 7478726016521 in words is "seven trillion, four hundred seventy-eight billion, seven hundred twenty-six million, sixteen thousand, five hundred twenty-one".