7945980521 has 2 divisors, whose sum is σ = 7945980522. Its totient is φ = 7945980520.

The previous prime is 7945980517. The next prime is 7945980529. The reversal of 7945980521 is 1250895497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6579643225 + 1366337296 = 81115^2 + 36964^2 .

It is a cyclic number.

It is not a de Polignac number, because 7945980521 - 2² = 7945980517 is a prime.

It is a super-2 number, since 2×7945980521² (a number of 21 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 7945980521.

It is not a weakly prime, because it can be changed into another prime (7945980529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3972990260 + 3972990261.

It is an arithmetic number, because the mean of its divisors is an integer number (3972990261).

Almost surely, 2^7945980521 is an apocalyptic number.

It is an amenable number.

7945980521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7945980521 is an equidigital number, since it uses as much as digits as its factorization.

7945980521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 50.

The square root of 7945980521 is about 89140.2295319010. The cubic root of 7945980521 is about 1995.4882062622.

The spelling of 7945980521 in words is "seven billion, nine hundred forty-five million, nine hundred eighty thousand, five hundred twenty-one".