65640011 has 4 divisors (see below), whose sum is σ = 65720592. Its totient is φ = 65559432.

The previous prime is 65639993. The next prime is 65640019. The reversal of 65640011 is 11004656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65640011 is a prime.

It is a super-2 number, since 2×65640011² = 8617222088160242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65640019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39056 + ... + 40701.

It is an arithmetic number, because the mean of its divisors is an integer number (16430148).

Almost surely, 2^65640011 is an apocalyptic number.

65640011 is a deficient number, since it is larger than the sum of its proper divisors (80581).

65640011 is an equidigital number, since it uses as much as digits as its factorization.

65640011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80580.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 65640011 is about 8101.8523190688. The cubic root of 65640011 is about 403.3879136725.

Adding to 65640011 its reverse (11004656), we get a palindrome (76644667).

The spelling of 65640011 in words is "sixty-five million, six hundred forty thousand, eleven".