65643923 has 2 divisors, whose sum is σ = 65643924. Its totient is φ = 65643922.

The previous prime is 65643889. The next prime is 65643943. The reversal of 65643923 is 32934656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65643923 - 2⁸ = 65643667 is a prime.

It is not a weakly prime, because it can be changed into another prime (65643943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32821961 + 32821962.

It is an arithmetic number, because the mean of its divisors is an integer number (32821962).

Almost surely, 2^65643923 is an apocalyptic number.

65643923 is a deficient number, since it is larger than the sum of its proper divisors (1).

65643923 is an equidigital number, since it uses as much as digits as its factorization.

65643923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 38.

The square root of 65643923 is about 8102.0937417436. The cubic root of 65643923 is about 403.3959271902.

It can be divided in two parts, 65643 and 923, that added together give a palindrome (66566).

The spelling of 65643923 in words is "sixty-five million, six hundred forty-three thousand, nine hundred twenty-three".