621066659 has 2 divisors, whose sum is σ = 621066660. Its totient is φ = 621066658.

The previous prime is 621066643. The next prime is 621066671. The reversal of 621066659 is 956660126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621066659 - 2⁴ = 621066643 is a prime.

It is not a weakly prime, because it can be changed into another prime (621066629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310533329 + 310533330.

It is an arithmetic number, because the mean of its divisors is an integer number (310533330).

Almost surely, 2^621066659 is an apocalyptic number.

621066659 is a deficient number, since it is larger than the sum of its proper divisors (1).

621066659 is an equidigital number, since it uses as much as digits as its factorization.

621066659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 621066659 is about 24921.2090196282. The cubic root of 621066659 is about 853.1906193253.

The spelling of 621066659 in words is "six hundred twenty-one million, sixty-six thousand, six hundred fifty-nine".