53646661 has 2 divisors, whose sum is σ = 53646662. Its totient is φ = 53646660.

The previous prime is 53646643. The next prime is 53646673. The reversal of 53646661 is 16664635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48916036 + 4730625 = 6994^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 53646661 - 2⁷ = 53646533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53646661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53646631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26823330 + 26823331.

It is an arithmetic number, because the mean of its divisors is an integer number (26823331).

Almost surely, 2^53646661 is an apocalyptic number.

It is an amenable number.

53646661 is a deficient number, since it is larger than the sum of its proper divisors (1).

53646661 is an equidigital number, since it uses as much as digits as its factorization.

53646661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 37.

The square root of 53646661 is about 7324.3880973089. The cubic root of 53646661 is about 377.1501042802.

The spelling of 53646661 in words is "fifty-three million, six hundred forty-six thousand, six hundred sixty-one".