253803661 has 2 divisors, whose sum is σ = 253803662. Its totient is φ = 253803660.

The previous prime is 253803647. The next prime is 253803707. The reversal of 253803661 is 166308352.

253803661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227074761 + 26728900 = 15069^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 253803661 - 2¹⁹ = 253279373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253803601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126901830 + 126901831.

It is an arithmetic number, because the mean of its divisors is an integer number (126901831).

Almost surely, 2^253803661 is an apocalyptic number.

It is an amenable number.

253803661 is a deficient number, since it is larger than the sum of its proper divisors (1).

253803661 is an equidigital number, since it uses as much as digits as its factorization.

253803661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 253803661 is about 15931.2165574384. The cubic root of 253803661 is about 633.1393326087.

The spelling of 253803661 in words is "two hundred fifty-three million, eight hundred three thousand, six hundred sixty-one".