65721363 has 8 divisors (see below), whose sum is σ = 88862976. Its totient is φ = 43197000.

The previous prime is 65721353. The next prime is 65721379. The reversal of 65721363 is 36312756.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65721363 - 2¹⁰ = 65720339 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (65721343) 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, 154063 + ... + 154488.

It is an arithmetic number, because the mean of its divisors is an integer number (11107872).

Almost surely, 2^65721363 is an apocalyptic number.

65721363 is a deficient number, since it is larger than the sum of its proper divisors (23141613).

65721363 is a wasteful number, since it uses less digits than its factorization.

65721363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308625.

The product of its digits is 22680, while the sum is 33.

The square root of 65721363 is about 8106.8713447297. The cubic root of 65721363 is about 403.5544932998.

The spelling of 65721363 in words is "sixty-five million, seven hundred twenty-one thousand, three hundred sixty-three".