65660138867 has 4 divisors (see below), whose sum is σ = 65666932320. Its totient is φ = 65653345416.

The previous prime is 65660138837. The next prime is 65660138903. The reversal of 65660138867 is 76883106656.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 65660138867 - 2¹⁰ = 65660137843 is a prime.

It is a super-2 number, since 2×65660138867² (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 (65660138837) 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, 3382208 + ... + 3401565.

It is an arithmetic number, because the mean of its divisors is an integer number (16416733080).

Almost surely, 2^65660138867 is an apocalyptic number.

65660138867 is a deficient number, since it is larger than the sum of its proper divisors (6793453).

65660138867 is an equidigital number, since it uses as much as digits as its factorization.

65660138867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6793452.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 65660138867 in words is "sixty-five billion, six hundred sixty million, one hundred thirty-eight thousand, eight hundred sixty-seven".