53106661 has 4 divisors (see below), whose sum is σ = 53977324. Its totient is φ = 52236000.

The previous prime is 53106659. The next prime is 53106707. The reversal of 53106661 is 16660135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13176900 + 39929761 = 3630^2 + 6319^2 .

It is a cyclic number.

It is not a de Polignac number, because 53106661 - 2¹ = 53106659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53106601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435240 + ... + 435361.

It is an arithmetic number, because the mean of its divisors is an integer number (13494331).

Almost surely, 2^53106661 is an apocalyptic number.

It is an amenable number.

53106661 is a deficient number, since it is larger than the sum of its proper divisors (870663).

53106661 is an equidigital number, since it uses as much as digits as its factorization.

53106661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870662.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 53106661 is about 7287.4317149459. The cubic root of 53106661 is about 375.8803872019.

Adding to 53106661 its reverse (16660135), we get a palindrome (69766796).

The spelling of 53106661 in words is "fifty-three million, one hundred six thousand, six hundred sixty-one".