65643937 has 6 divisors (see below), whose sum is σ = 65961618. Its totient is φ = 65327472.

The previous prime is 65643923. The next prime is 65643943. The reversal of 65643937 is 73934656.

It can be written as a sum of positive squares in only one way, i.e., 63345681 + 2298256 = 7959^2 + 1516^2 .

It is a de Polignac number, because none of the positive numbers 2^k-65643937 is a prime.

It is a Duffinian number.

Its product of digits (408240) is a multiple of the sum of its prime factors (1215).

It is a junction number, because it is equal to n+sod(n) for n = 65643893 and 65643902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65643947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143413 + ... + 143869.

It is an arithmetic number, because the mean of its divisors is an integer number (10993603).

Almost surely, 2^65643937 is an apocalyptic number.

It is an amenable number.

65643937 is a deficient number, since it is larger than the sum of its proper divisors (317681).

65643937 is an frugal number, since it uses more digits than its factorization.

65643937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215 (or 836 counting only the distinct ones).

The product of its digits is 408240, while the sum is 43.

The square root of 65643937 is about 8102.0946057177. The cubic root of 65643937 is about 403.3959558679.

It can be divided in two parts, 6564 and 3937, that added together give a palindrome (10501).

The spelling of 65643937 in words is "sixty-five million, six hundred forty-three thousand, nine hundred thirty-seven".