65421563 has 8 divisors (see below), whose sum is σ = 67691520. Its totient is φ = 63161640.

The previous prime is 65421529. The next prime is 65421571. The reversal of 65421563 is 36512456.

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 65421563 - 2²⁴ = 48644347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65421523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12218 + ... + 16736.

It is an arithmetic number, because the mean of its divisors is an integer number (8461440).

Almost surely, 2^65421563 is an apocalyptic number.

65421563 is a deficient number, since it is larger than the sum of its proper divisors (2269957).

65421563 is a wasteful number, since it uses less digits than its factorization.

65421563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017.

The product of its digits is 21600, while the sum is 32.

The square root of 65421563 is about 8088.3597224654. The cubic root of 65421563 is about 402.9399286933.

The spelling of 65421563 in words is "sixty-five million, four hundred twenty-one thousand, five hundred sixty-three".