646145323 has 2 divisors, whose sum is σ = 646145324. Its totient is φ = 646145322.

The previous prime is 646145321. The next prime is 646145359. The reversal of 646145323 is 323541646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646145323 - 2¹ = 646145321 is a prime.

Together with 646145321, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (646145321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323072661 + 323072662.

It is an arithmetic number, because the mean of its divisors is an integer number (323072662).

Almost surely, 2^646145323 is an apocalyptic number.

646145323 is a deficient number, since it is larger than the sum of its proper divisors (1).

646145323 is an equidigital number, since it uses as much as digits as its factorization.

646145323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 34.

The square root of 646145323 is about 25419.3887219972. The cubic root of 646145323 is about 864.5233646621.

Adding to 646145323 its reverse (323541646), we get a palindrome (969686969).

The spelling of 646145323 in words is "six hundred forty-six million, one hundred forty-five thousand, three hundred twenty-three".