121616160065 has 8 divisors (see below), whose sum is σ = 149883700200. Its totient is φ = 94663389312.

The previous prime is 121616160053. The next prime is 121616160079. The reversal of 121616160065 is 560061616121.

It can be written as a sum of positive squares in 4 ways, for example, as 35204266384 + 86411893681 = 187628^2 + 293959^2 .

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 121616160065 - 2⁸ = 121616159809 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328692140 + ... + 328692509.

It is an arithmetic number, because the mean of its divisors is an integer number (18735462525).

Almost surely, 2^121616160065 is an apocalyptic number.

It is an amenable number.

121616160065 is a deficient number, since it is larger than the sum of its proper divisors (28267540135).

121616160065 is an equidigital number, since it uses as much as digits as its factorization.

121616160065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657384691.

The product of its (nonzero) digits is 12960, while the sum is 35.

Adding to 121616160065 its reverse (560061616121), we get a palindrome (681677776186).

The spelling of 121616160065 in words is "one hundred twenty-one billion, six hundred sixteen million, one hundred sixty thousand, sixty-five".