65640001 has 16 divisors (see below), whose sum is σ = 76279680. Its totient is φ = 55324800.

The previous prime is 65639993. The next prime is 65640019. The reversal of 65640001 is 10004656.

65640001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 65640001 - 2³ = 65639993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65646001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160285 + ... + 160693.

It is an arithmetic number, because the mean of its divisors is an integer number (4767480).

Almost surely, 2^65640001 is an apocalyptic number.

It is an amenable number.

65640001 is a deficient number, since it is larger than the sum of its proper divisors (10639679).

65640001 is a wasteful number, since it uses less digits than its factorization.

65640001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 65640001 is about 8101.8517019259. The cubic root of 65640001 is about 403.3878931876.

Adding to 65640001 its reverse (10004656), we get a palindrome (75644657).

The spelling of 65640001 in words is "sixty-five million, six hundred forty thousand, one".