6706601521 has 2 divisors, whose sum is σ = 6706601522. Its totient is φ = 6706601520.

The previous prime is 6706601519. The next prime is 6706601543. The reversal of 6706601521 is 1251066076.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6438297121 + 268304400 = 80239^2 + 16380^2 .

It is a cyclic number.

It is not a de Polignac number, because 6706601521 - 2¹ = 6706601519 is a prime.

It is a super-2 number, since 2×6706601521² = 89957007922959026882, which contains 22 as substring.

Together with 6706601519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6706601581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3353300760 + 3353300761.

It is an arithmetic number, because the mean of its divisors is an integer number (3353300761).

Almost surely, 2^6706601521 is an apocalyptic number.

It is an amenable number.

6706601521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6706601521 is an equidigital number, since it uses as much as digits as its factorization.

6706601521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 6706601521 is about 81893.8429981156. The cubic root of 6706601521 is about 1885.8225925218.

Adding to 6706601521 its reverse (1251066076), we get a palindrome (7957667597).

The spelling of 6706601521 in words is "six billion, seven hundred six million, six hundred one thousand, five hundred twenty-one".