65606666661 has 32 divisors (see below), whose sum is σ = 101024757120. Its totient is φ = 42042903552.

The previous prime is 65606666639. The next prime is 65606666669. The reversal of 65606666661 is 16666660656.

It is not a de Polignac number, because 65606666661 - 2¹⁰ = 65606665637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65606666598 and 65606666607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65606666669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312700 + ... + 478533.

It is an arithmetic number, because the mean of its divisors is an integer number (3157023660).

Almost surely, 2^65606666661 is an apocalyptic number.

It is an amenable number.

65606666661 is a deficient number, since it is larger than the sum of its proper divisors (35418090459).

65606666661 is a wasteful number, since it uses less digits than its factorization.

65606666661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791362 (or 791356 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 65606666661 in words is "sixty-five billion, six hundred six million, six hundred sixty-six thousand, six hundred sixty-one".