65721411 has 24 divisors (see below), whose sum is σ = 108725760. Its totient is φ = 37474416.

The previous prime is 65721379. The next prime is 65721451. The reversal of 65721411 is 11412756.

It is a happy number.

65721411 is a `hidden beast` number, since 657 + 2 + 1 + 4 + 1 + 1 = 666.

It is not a de Polignac number, because 65721411 - 2⁵ = 65721379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65721451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40726 + ... + 42308.

It is an arithmetic number, because the mean of its divisors is an integer number (4530240).

Almost surely, 2^65721411 is an apocalyptic number.

65721411 is a deficient number, since it is larger than the sum of its proper divisors (43004349).

65721411 is a wasteful number, since it uses less digits than its factorization.

65721411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255 (or 2252 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 65721411 is about 8106.8743051808. The cubic root of 65721411 is about 403.5545915459.

The spelling of 65721411 in words is "sixty-five million, seven hundred twenty-one thousand, four hundred eleven".