65721153 has 8 divisors (see below), whose sum is σ = 87776416. Its totient is φ = 43740000.

The previous prime is 65721121. The next prime is 65721169. The reversal of 65721153 is 35112756.

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

It is not a de Polignac number, because 65721153 - 2⁵ = 65721121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65721153.

It is not an unprimeable number, because it can be changed into a prime (65721353) 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, 16423 + ... + 20028.

It is an arithmetic number, because the mean of its divisors is an integer number (10972052).

Almost surely, 2^65721153 is an apocalyptic number.

It is an amenable number.

65721153 is a deficient number, since it is larger than the sum of its proper divisors (22055263).

65721153 is a wasteful number, since it uses less digits than its factorization.

65721153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37055.

The product of its digits is 6300, while the sum is 30.

The square root of 65721153 is about 8106.8583927438. The cubic root of 65721153 is about 403.5540634723.

The spelling of 65721153 in words is "sixty-five million, seven hundred twenty-one thousand, one hundred fifty-three".