6696621629 has 2 divisors, whose sum is σ = 6696621630. Its totient is φ = 6696621628.

The previous prime is 6696621559. The next prime is 6696621647. The reversal of 6696621629 is 9261266966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5791514404 + 905107225 = 76102^2 + 30085^2 .

It is a cyclic number.

It is not a de Polignac number, because 6696621629 - 2¹² = 6696617533 is a prime.

It is a super-2 number, since 2×6696621629² = 89689482483981227282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6696621229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3348310814 + 3348310815.

It is an arithmetic number, because the mean of its divisors is an integer number (3348310815).

Almost surely, 2^6696621629 is an apocalyptic number.

It is an amenable number.

6696621629 is a deficient number, since it is larger than the sum of its proper divisors (1).

6696621629 is an equidigital number, since it uses as much as digits as its factorization.

6696621629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 53.

The square root of 6696621629 is about 81832.8884312414. Note that the first 3 decimals coincide. The cubic root of 6696621629 is about 1884.8867161925.

The spelling of 6696621629 in words is "six billion, six hundred ninety-six million, six hundred twenty-one thousand, six hundred twenty-nine".