65144215 has 4 divisors (see below), whose sum is σ = 78173064. Its totient is φ = 52115368.

The previous prime is 65144213. The next prime is 65144227. The reversal of 65144215 is 51244156.

65144215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65144215 - 2¹ = 65144213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65144213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6514417 + ... + 6514426.

It is an arithmetic number, because the mean of its divisors is an integer number (19543266).

Almost surely, 2^65144215 is an apocalyptic number.

65144215 is a deficient number, since it is larger than the sum of its proper divisors (13028849).

65144215 is a wasteful number, since it uses less digits than its factorization.

65144215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13028848.

The product of its digits is 4800, while the sum is 28.

The square root of 65144215 is about 8071.1966275144. The cubic root of 65144215 is about 402.3697146577.

The spelling of 65144215 in words is "sixty-five million, one hundred forty-four thousand, two hundred fifteen".