65941955881 has 4 divisors (see below), whose sum is σ = 65949002064. Its totient is φ = 65934909700.

The previous prime is 65941955861. The next prime is 65941955897. The reversal of 65941955881 is 18855914956.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65941955881 - 2²¹ = 65939858729 is a prime.

It is a super-2 number, since 2×65941955881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65941955861) 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 3 ways as a sum of consecutive naturals, for example, 3509035 + ... + 3527776.

It is an arithmetic number, because the mean of its divisors is an integer number (16487250516).

Almost surely, 2^65941955881 is an apocalyptic number.

It is an amenable number.

65941955881 is a deficient number, since it is larger than the sum of its proper divisors (7046183).

65941955881 is an equidigital number, since it uses as much as digits as its factorization.

65941955881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7046182.

The product of its digits is 15552000, while the sum is 61.

The spelling of 65941955881 in words is "sixty-five billion, nine hundred forty-one million, nine hundred fifty-five thousand, eight hundred eighty-one".