65656665657 has 12 divisors (see below), whose sum is σ = 103458988464. Its totient is φ = 39791918520.

The previous prime is 65656665589. The next prime is 65656665661. The reversal of 65656665657 is 75656665656.

It is a happy number.

It is not a de Polignac number, because 65656665657 - 2⁸ = 65656665401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65656665594 and 65656665603.

It is not an unprimeable number, because it can be changed into a prime (65656665257) 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 11 ways as a sum of consecutive naturals, for example, 331599223 + ... + 331599420.

It is an arithmetic number, because the mean of its divisors is an integer number (8621582372).

Almost surely, 2^65656665657 is an apocalyptic number.

It is an amenable number.

65656665657 is a deficient number, since it is larger than the sum of its proper divisors (37802322807).

65656665657 is a wasteful number, since it uses less digits than its factorization.

65656665657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663198660 (or 663198657 counting only the distinct ones).

The product of its digits is 204120000, while the sum is 63.

Subtracting 65656665657 from its reverse (75656665656), we obtain a palindrome (9999999999).

The spelling of 65656665657 in words is "sixty-five billion, six hundred fifty-six million, six hundred sixty-five thousand, six hundred fifty-seven".