53816665 has 16 divisors (see below), whose sum is σ = 77015808. Its totient is φ = 35297856.

The previous prime is 53816647. The next prime is 53816669. The reversal of 53816665 is 56661835.

It is a cyclic number.

It is not a de Polignac number, because 53816665 - 2⁹ = 53816153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53816669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32622 + ... + 34231.

It is an arithmetic number, because the mean of its divisors is an integer number (4813488).

Almost surely, 2^53816665 is an apocalyptic number.

It is an amenable number.

53816665 is a deficient number, since it is larger than the sum of its proper divisors (23199143).

53816665 is a wasteful number, since it uses less digits than its factorization.

53816665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66888.

The product of its digits is 129600, while the sum is 40.

The square root of 53816665 is about 7335.9842557083. The cubic root of 53816665 is about 377.5480751018.

The spelling of 53816665 in words is "fifty-three million, eight hundred sixteen thousand, six hundred sixty-five".