65684057 has 4 divisors (see below), whose sum is σ = 65700276. Its totient is φ = 65667840.

The previous prime is 65684041. The next prime is 65684063. The reversal of 65684057 is 75048656.

65684057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15713296 + 49970761 = 3964^2 + 7069^2 .

It is a cyclic number.

It is not a de Polignac number, because 65684057 - 2⁴ = 65684041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65684557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3653 + ... + 12029.

It is an arithmetic number, because the mean of its divisors is an integer number (16425069).

Almost surely, 2^65684057 is an apocalyptic number.

It is an amenable number.

65684057 is a deficient number, since it is larger than the sum of its proper divisors (16219).

65684057 is an equidigital number, since it uses as much as digits as its factorization.

65684057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16218.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 65684057 is about 8104.5701304881. The cubic root of 65684057 is about 403.4781211089.

The spelling of 65684057 in words is "sixty-five million, six hundred eighty-four thousand, fifty-seven".