65216451 has 4 divisors (see below), whose sum is σ = 86955272. Its totient is φ = 43477632.

The previous prime is 65216413. The next prime is 65216461. The reversal of 65216451 is 15461256.

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

It is not a de Polignac number, because 65216451 - 2⁹ = 65215939 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (65216461) 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, 10869406 + ... + 10869411.

It is an arithmetic number, because the mean of its divisors is an integer number (21738818).

Almost surely, 2^65216451 is an apocalyptic number.

65216451 is a deficient number, since it is larger than the sum of its proper divisors (21738821).

65216451 is a wasteful number, since it uses less digits than its factorization.

65216451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21738820.

The product of its digits is 7200, while the sum is 30.

The square root of 65216451 is about 8075.6703127357. The cubic root of 65216451 is about 402.5183839963.

The spelling of 65216451 in words is "sixty-five million, two hundred sixteen thousand, four hundred fifty-one".