65643243 has 8 divisors (see below), whose sum is σ = 87571008. Its totient is φ = 43738824.

The previous prime is 65643229. The next prime is 65643257. The reversal of 65643243 is 34234656.

It is an interprime number because it is at equal distance from previous prime (65643229) and next prime (65643257).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65643243 - 2¹³ = 65635051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65643283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380 + ... + 11702.

It is an arithmetic number, because the mean of its divisors is an integer number (10946376).

Almost surely, 2^65643243 is an apocalyptic number.

65643243 is a deficient number, since it is larger than the sum of its proper divisors (21927765).

65643243 is a wasteful number, since it uses less digits than its factorization.

65643243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11673.

The product of its digits is 51840, while the sum is 33.

The square root of 65643243 is about 8102.0517771735. The cubic root of 65643243 is about 403.3945342703.

Adding to 65643243 its reverse (34234656), we get a palindrome (99877899).

The spelling of 65643243 in words is "sixty-five million, six hundred forty-three thousand, two hundred forty-three".