65660001 has 16 divisors (see below), whose sum is σ = 101124288. Its totient is φ = 37452800.

The previous prime is 65659969. The next prime is 65660003. The reversal of 65660001 is 10006656.

It is not a de Polignac number, because 65660001 - 2⁵ = 65659969 is a prime.

It is a super-2 number, since 2×65660001² = 8622471462640002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65660003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57960 + ... + 59081.

It is an arithmetic number, because the mean of its divisors is an integer number (6320268).

Almost surely, 2^65660001 is an apocalyptic number.

It is an amenable number.

65660001 is a deficient number, since it is larger than the sum of its proper divisors (35464287).

65660001 is a wasteful number, since it uses less digits than its factorization.

65660001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117072.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 65660001 is about 8103.0858936580. The cubic root of 65660001 is about 403.4288587497.

Adding to 65660001 its reverse (10006656), we get a palindrome (75666657).

It can be divided in two parts, 65 and 660001, that added together give a palindrome (660066).

The spelling of 65660001 in words is "sixty-five million, six hundred sixty thousand, one".