65660211061 has 4 divisors (see below), whose sum is σ = 67924356300. Its totient is φ = 63396065824.

The previous prime is 65660211017. The next prime is 65660211151. The reversal of 65660211061 is 16011206656.

It is a happy number.

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 49040102500 + 16620108561 = 221450^2 + 128919^2 .

It is a cyclic number.

It is not a de Polignac number, because 65660211061 - 2²⁷ = 65525993333 is a prime.

It is a super-2 number, since 2×65660211061² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65660211161) 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, 1132072576 + ... + 1132072633.

It is an arithmetic number, because the mean of its divisors is an integer number (16981089075).

Almost surely, 2^65660211061 is an apocalyptic number.

It is an amenable number.

65660211061 is a deficient number, since it is larger than the sum of its proper divisors (2264145239).

65660211061 is a wasteful number, since it uses less digits than its factorization.

65660211061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264145238.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 65660211061 in words is "sixty-five billion, six hundred sixty million, two hundred eleven thousand, sixty-one".