621665323 has 2 divisors, whose sum is σ = 621665324. Its totient is φ = 621665322.

The previous prime is 621665173. The next prime is 621665353. The reversal of 621665323 is 323566126.

621665323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621665323 is a prime.

It is not a weakly prime, because it can be changed into another prime (621665353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310832661 + 310832662.

It is an arithmetic number, because the mean of its divisors is an integer number (310832662).

Almost surely, 2^621665323 is an apocalyptic number.

621665323 is a deficient number, since it is larger than the sum of its proper divisors (1).

621665323 is an equidigital number, since it uses as much as digits as its factorization.

621665323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 34.

The square root of 621665323 is about 24933.2172613163. The cubic root of 621665323 is about 853.4646696078.

The spelling of 621665323 in words is "six hundred twenty-one million, six hundred sixty-five thousand, three hundred twenty-three".