7730130716521 has 4 divisors (see below), whose sum is σ = 7730206210692. Its totient is φ = 7730055222352.

The previous prime is 7730130716479. The next prime is 7730130716593. The reversal of 7730130716521 is 1256170310377.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4761281105296 + 2968849611225 = 2182036^2 + 1723035^2 .

It is a cyclic number.

It is not a de Polignac number, because 7730130716521 - 2²⁵ = 7730097162089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7730140716521) 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 in 3 ways as a sum of consecutive naturals, for example, 37593286 + ... + 37798351.

It is an arithmetic number, because the mean of its divisors is an integer number (1932551552673).

Almost surely, 2^{7730130716521} is an apocalyptic number.

It is an amenable number.

7730130716521 is a deficient number, since it is larger than the sum of its proper divisors (75494171).

7730130716521 is a wasteful number, since it uses less digits than its factorization.

7730130716521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75494170.

The product of its (nonzero) digits is 185220, while the sum is 43.

The spelling of 7730130716521 in words is "seven trillion, seven hundred thirty billion, one hundred thirty million, seven hundred sixteen thousand, five hundred twenty-one".