6955640621 has 2 divisors, whose sum is σ = 6955640622. Its totient is φ = 6955640620.

The previous prime is 6955640603. The next prime is 6955640623. The reversal of 6955640621 is 1260465596.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4030345225 + 2925295396 = 63485^2 + 54086^2 .

It is a cyclic number.

It is not a de Polignac number, because 6955640621 - 2¹⁰ = 6955639597 is a prime.

Together with 6955640623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6955640623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3477820310 + 3477820311.

It is an arithmetic number, because the mean of its divisors is an integer number (3477820311).

Almost surely, 2^6955640621 is an apocalyptic number.

It is an amenable number.

6955640621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6955640621 is an equidigital number, since it uses as much as digits as its factorization.

6955640621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 6955640621 is about 83400.4833379280. The cubic root of 6955640621 is about 1908.8818342159.

The spelling of 6955640621 in words is "six billion, nine hundred fifty-five million, six hundred forty thousand, six hundred twenty-one".