53361661 has 2 divisors, whose sum is σ = 53361662. Its totient is φ = 53361660.

The previous prime is 53361647. The next prime is 53361673. The reversal of 53361661 is 16616335.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32376100 + 20985561 = 5690^2 + 4581^2 .

It is a cyclic number.

It is not a de Polignac number, because 53361661 - 2⁵ = 53361629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53361611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26680830 + 26680831.

It is an arithmetic number, because the mean of its divisors is an integer number (26680831).

Almost surely, 2^53361661 is an apocalyptic number.

It is an amenable number.

53361661 is a deficient number, since it is larger than the sum of its proper divisors (1).

53361661 is an equidigital number, since it uses as much as digits as its factorization.

53361661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 53361661 is about 7304.9066386916. The cubic root of 53361661 is about 376.4810431442.

Adding to 53361661 its reverse (16616335), we get a palindrome (69977996).

The spelling of 53361661 in words is "fifty-three million, three hundred sixty-one thousand, six hundred sixty-one".