661774103 has 2 divisors, whose sum is σ = 661774104. Its totient is φ = 661774102.

The previous prime is 661774093. The next prime is 661774109. The reversal of 661774103 is 301477166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661774103 - 2⁶ = 661774039 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661774109) 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, 330887051 + 330887052.

It is an arithmetic number, because the mean of its divisors is an integer number (330887052).

Almost surely, 2^661774103 is an apocalyptic number.

661774103 is a deficient number, since it is larger than the sum of its proper divisors (1).

661774103 is an equidigital number, since it uses as much as digits as its factorization.

661774103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 661774103 is about 25724.9704178644. The cubic root of 661774103 is about 871.4381915333.

The spelling of 661774103 in words is "six hundred sixty-one million, seven hundred seventy-four thousand, one hundred three".