65660100001 has 4 divisors (see below), whose sum is σ = 65867229972. Its totient is φ = 65452970032.

The previous prime is 65660099993. The next prime is 65660100007. The reversal of 65660100001 is 10000106656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33324867601 + 32335232400 = 182551^2 + 179820^2 .

It is a cyclic number.

It is not a de Polignac number, because 65660100001 - 2³ = 65660099993 is a prime.

It is a super-2 number, since 2×65660100001² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65660100007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103564510 + ... + 103565143.

It is an arithmetic number, because the mean of its divisors is an integer number (16466807493).

Almost surely, 2^65660100001 is an apocalyptic number.

It is an amenable number.

65660100001 is a deficient number, since it is larger than the sum of its proper divisors (207129971).

65660100001 is a wasteful number, since it uses less digits than its factorization.

65660100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207129970.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 65660100001 its reverse (10000106656), we get a palindrome (75660206657).

The spelling of 65660100001 in words is "sixty-five billion, six hundred sixty million, one hundred thousand, one".