65518342681 has 4 divisors (see below), whose sum is σ = 71474555664. Its totient is φ = 59562129700.

The previous prime is 65518342667. The next prime is 65518342691. The reversal of 65518342681 is 18624381556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65518342681 - 2⁵ = 65518342649 is a prime.

It is a super-2 number, since 2×65518342681² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65518342691) 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, 2978106475 + ... + 2978106496.

It is an arithmetic number, because the mean of its divisors is an integer number (17868638916).

Almost surely, 2^65518342681 is an apocalyptic number.

It is an amenable number.

65518342681 is a deficient number, since it is larger than the sum of its proper divisors (5956212983).

65518342681 is a wasteful number, since it uses less digits than its factorization.

65518342681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5956212982.

The product of its digits is 1382400, while the sum is 49.

The spelling of 65518342681 in words is "sixty-five billion, five hundred eighteen million, three hundred forty-two thousand, six hundred eighty-one".