65120067561 has 4 divisors (see below), whose sum is σ = 86826756752. Its totient is φ = 43413378372.

The previous prime is 65120067557. The next prime is 65120067619. The reversal of 65120067561 is 16576002156.

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 not a de Polignac number, because 65120067561 - 2² = 65120067557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65120067511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10853344591 + ... + 10853344596.

It is an arithmetic number, because the mean of its divisors is an integer number (21706689188).

Almost surely, 2^65120067561 is an apocalyptic number.

It is an amenable number.

65120067561 is a deficient number, since it is larger than the sum of its proper divisors (21706689191).

65120067561 is a wasteful number, since it uses less digits than its factorization.

65120067561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21706689190.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 65120067561 in words is "sixty-five billion, one hundred twenty million, sixty-seven thousand, five hundred sixty-one".