65656140479999 has 4 divisors (see below), whose sum is σ = 65658505386936. Its totient is φ = 65653775573064.

The previous prime is 65656140479981. The next prime is 65656140480019. The reversal of 65656140479999 is 99997404165656.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65656140479999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65656340479999) 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, 1182411824 + ... + 1182467349.

It is an arithmetic number, because the mean of its divisors is an integer number (16414626346734).

Almost surely, 2^{65656140479999} is an apocalyptic number.

65656140479999 is a deficient number, since it is larger than the sum of its proper divisors (2364906937).

65656140479999 is a wasteful number, since it uses less digits than its factorization.

65656140479999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364906936.

The product of its (nonzero) digits is 3968092800, while the sum is 80.

The spelling of 65656140479999 in words is "sixty-five trillion, six hundred fifty-six billion, one hundred forty million, four hundred seventy-nine thousand, nine hundred ninety-nine".