661303127 has 2 divisors, whose sum is σ = 661303128. Its totient is φ = 661303126.

The previous prime is 661303087. The next prime is 661303169. The reversal of 661303127 is 721303166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661303127 - 2¹⁸ = 661040983 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661303127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661303177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330651563 + 330651564.

It is an arithmetic number, because the mean of its divisors is an integer number (330651564).

Almost surely, 2^661303127 is an apocalyptic number.

661303127 is a deficient number, since it is larger than the sum of its proper divisors (1).

661303127 is an equidigital number, since it uses as much as digits as its factorization.

661303127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 661303127 is about 25715.8147255731. The cubic root of 661303127 is about 871.2314120721.

The spelling of 661303127 in words is "six hundred sixty-one million, three hundred three thousand, one hundred twenty-seven".