65616655105 has 4 divisors (see below), whose sum is σ = 78739986132. Its totient is φ = 52493324080.

The previous prime is 65616655073. The next prime is 65616655129. The reversal of 65616655105 is 50155661656.

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 13280027121 + 52336627984 = 115239^2 + 228772^2 .

It is not a de Polignac number, because 65616655105 - 2⁵ = 65616655073 is a prime.

It is a super-2 number, since 2×65616655105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6561665506 + ... + 6561665515.

It is an arithmetic number, because the mean of its divisors is an integer number (19684996533).

Almost surely, 2^65616655105 is an apocalyptic number.

It is an amenable number.

65616655105 is a deficient number, since it is larger than the sum of its proper divisors (13123331027).

65616655105 is a wasteful number, since it uses less digits than its factorization.

65616655105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13123331026.

The product of its (nonzero) digits is 810000, while the sum is 46.

It can be divided in two parts, 6561 and 6655105, that added together give a palindrome (6661666).

The spelling of 65616655105 in words is "sixty-five billion, six hundred sixteen million, six hundred fifty-five thousand, one hundred five".