65995121 has 4 divisors (see below), whose sum is σ = 66048000. Its totient is φ = 65942244.

The previous prime is 65995091. The next prime is 65995129. The reversal of 65995121 is 12159956.

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 a de Polignac number, because none of the positive numbers 2^k-65995121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65995129) 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, 24521 + ... + 27078.

It is an arithmetic number, because the mean of its divisors is an integer number (16512000).

Almost surely, 2^65995121 is an apocalyptic number.

It is an amenable number.

65995121 is a deficient number, since it is larger than the sum of its proper divisors (52879).

65995121 is a wasteful number, since it uses less digits than its factorization.

65995121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52878.

The product of its digits is 24300, while the sum is 38.

The square root of 65995121 is about 8123.7381173940. The cubic root of 65995121 is about 404.1140436299.

The spelling of 65995121 in words is "sixty-five million, nine hundred ninety-five thousand, one hundred twenty-one".