65161011561 has 8 divisors (see below), whose sum is σ = 86882834880. Its totient is φ = 43439931312.

The previous prime is 65161011551. The next prime is 65161011563. The reversal of 65161011561 is 16511016156.

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

It is not a de Polignac number, because 65161011561 - 2⁵ = 65161011529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65161011563) 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, 68611 + ... + 367463.

It is an arithmetic number, because the mean of its divisors is an integer number (10860354360).

Almost surely, 2^65161011561 is an apocalyptic number.

It is an amenable number.

65161011561 is a deficient number, since it is larger than the sum of its proper divisors (21721823319).

65161011561 is a wasteful number, since it uses less digits than its factorization.

65161011561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371535.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 65161011561 in words is "sixty-five billion, one hundred sixty-one million, eleven thousand, five hundred sixty-one".