7108166521 has 2 divisors, whose sum is σ = 7108166522. Its totient is φ = 7108166520.

The previous prime is 7108166519. The next prime is 7108166567. The reversal of 7108166521 is 1256618017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6968075625 + 140090896 = 83475^2 + 11836^2 .

It is an emirp because it is prime and its reverse (1256618017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7108166521 - 2¹ = 7108166519 is a prime.

Together with 7108166519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7108166591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3554083260 + 3554083261.

It is an arithmetic number, because the mean of its divisors is an integer number (3554083261).

Almost surely, 2^7108166521 is an apocalyptic number.

It is an amenable number.

7108166521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7108166521 is an equidigital number, since it uses as much as digits as its factorization.

7108166521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 7108166521 is about 84309.9431917731. The cubic root of 7108166521 is about 1922.7339633179.

The spelling of 7108166521 in words is "seven billion, one hundred eight million, one hundred sixty-six thousand, five hundred twenty-one".