65643945 has 16 divisors (see below), whose sum is σ = 107013312. Its totient is φ = 34349120.

The previous prime is 65643943. The next prime is 65643947. The reversal of 65643945 is 54934656.

It is an interprime number because it is at equal distance from previous prime (65643943) and next prime (65643947).

It is not a de Polignac number, because 65643945 - 2¹ = 65643943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65643897 and 65643906.

It is not an unprimeable number, because it can be changed into a prime (65643943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40491 + ... + 42080.

It is an arithmetic number, because the mean of its divisors is an integer number (6688332).

Almost surely, 2^65643945 is an apocalyptic number.

It is an amenable number.

65643945 is a deficient number, since it is larger than the sum of its proper divisors (41369367).

65643945 is a wasteful number, since it uses less digits than its factorization.

65643945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82632.

The product of its digits is 388800, while the sum is 42.

The square root of 65643945 is about 8102.0950994172. The cubic root of 65643945 is about 403.3959722551.

The spelling of 65643945 in words is "sixty-five million, six hundred forty-three thousand, nine hundred forty-five".