7066121521 has 2 divisors, whose sum is σ = 7066121522. Its totient is φ = 7066121520.

The previous prime is 7066121483. The next prime is 7066121551. The reversal of 7066121521 is 1251216607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4435560000 + 2630561521 = 66600^2 + 51289^2 .

It is a cyclic number.

It is not a de Polignac number, because 7066121521 - 2⁷ = 7066121393 is a prime.

It is not a weakly prime, because it can be changed into another prime (7066121551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3533060760 + 3533060761.

It is an arithmetic number, because the mean of its divisors is an integer number (3533060761).

Almost surely, 2^7066121521 is an apocalyptic number.

It is an amenable number.

7066121521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7066121521 is an equidigital number, since it uses as much as digits as its factorization.

7066121521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 7066121521 is about 84060.2255588218. The cubic root of 7066121521 is about 1918.9354559700.

The spelling of 7066121521 in words is "seven billion, sixty-six million, one hundred twenty-one thousand, five hundred twenty-one".