65881618811 has 4 divisors (see below), whose sum is σ = 68153398800. Its totient is φ = 63609838824.

The previous prime is 65881618771. The next prime is 65881618867. The reversal of 65881618811 is 11881618856.

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

It is a cyclic number.

It is not a de Polignac number, because 65881618811 - 2²⁶ = 65814509947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65881618871) 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, 1135889951 + ... + 1135890008.

It is an arithmetic number, because the mean of its divisors is an integer number (17038349700).

Almost surely, 2^65881618811 is an apocalyptic number.

65881618811 is a deficient number, since it is larger than the sum of its proper divisors (2271779989).

65881618811 is a wasteful number, since it uses less digits than its factorization.

65881618811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271779988.

The product of its digits is 737280, while the sum is 53.

The spelling of 65881618811 in words is "sixty-five billion, eight hundred eighty-one million, six hundred eighteen thousand, eight hundred eleven".