65612316121 has 4 divisors (see below), whose sum is σ = 71577072144. Its totient is φ = 59647560100.

The previous prime is 65612316103. The next prime is 65612316149. The reversal of 65612316121 is 12161321656.

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 65612316121 - 2³⁵ = 31252577753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65612316421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2982377995 + ... + 2982378016.

It is an arithmetic number, because the mean of its divisors is an integer number (17894268036).

Almost surely, 2^65612316121 is an apocalyptic number.

It is an amenable number.

65612316121 is a deficient number, since it is larger than the sum of its proper divisors (5964756023).

65612316121 is a wasteful number, since it uses less digits than its factorization.

65612316121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964756022.

The product of its digits is 12960, while the sum is 34.

Adding to 65612316121 its reverse (12161321656), we get a palindrome (77773637777).

The spelling of 65612316121 in words is "sixty-five billion, six hundred twelve million, three hundred sixteen thousand, one hundred twenty-one".