65856661911 has 48 divisors (see below), whose sum is σ = 98340802560. Its totient is φ = 42443533440.

The previous prime is 65856661883. The next prime is 65856661943. The reversal of 65856661911 is 11916665856.

It is not a de Polignac number, because 65856661911 - 2⁹ = 65856661399 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65856661961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24130795 + ... + 24133523.

It is an arithmetic number, because the mean of its divisors is an integer number (2048766720).

Almost surely, 2^65856661911 is an apocalyptic number.

65856661911 is a deficient number, since it is larger than the sum of its proper divisors (32484140649).

65856661911 is a wasteful number, since it uses less digits than its factorization.

65856661911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396 (or 3393 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The spelling of 65856661911 in words is "sixty-five billion, eight hundred fifty-six million, six hundred sixty-one thousand, nine hundred eleven".