65776891961 has 8 divisors (see below), whose sum is σ = 71788684800. Its totient is φ = 59770445040.

The previous prime is 65776891951. The next prime is 65776891967. The reversal of 65776891961 is 16919867756.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65776891961 - 2⁶ = 65776891897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65776891967) 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 7 ways as a sum of consecutive naturals, for example, 1310726 + ... + 1359983.

It is an arithmetic number, because the mean of its divisors is an integer number (8973585600).

Almost surely, 2^65776891961 is an apocalyptic number.

It is an amenable number.

65776891961 is a deficient number, since it is larger than the sum of its proper divisors (6011792839).

65776891961 is a wasteful number, since it uses less digits than its factorization.

65776891961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672959.

The product of its digits is 34292160, while the sum is 65.

The spelling of 65776891961 in words is "sixty-five billion, seven hundred seventy-six million, eight hundred ninety-one thousand, nine hundred sixty-one".