53550661 has 2 divisors, whose sum is σ = 53550662. Its totient is φ = 53550660.

The previous prime is 53550643. The next prime is 53550689. The reversal of 53550661 is 16605535.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48233025 + 5317636 = 6945^2 + 2306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53550661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53550631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26775330 + 26775331.

It is an arithmetic number, because the mean of its divisors is an integer number (26775331).

Almost surely, 2^53550661 is an apocalyptic number.

It is an amenable number.

53550661 is a deficient number, since it is larger than the sum of its proper divisors (1).

53550661 is an equidigital number, since it uses as much as digits as its factorization.

53550661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 53550661 is about 7317.8317143810. The cubic root of 53550661 is about 376.9250015568.

The spelling of 53550661 in words is "fifty-three million, five hundred fifty thousand, six hundred sixty-one".