66149903 has 2 divisors, whose sum is σ = 66149904. Its totient is φ = 66149902.

The previous prime is 66149893. The next prime is 66149947. The reversal of 66149903 is 30994166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66149903 - 2¹⁰ = 66148879 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 (66149983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33074951 + 33074952.

It is an arithmetic number, because the mean of its divisors is an integer number (33074952).

Almost surely, 2^66149903 is an apocalyptic number.

66149903 is a deficient number, since it is larger than the sum of its proper divisors (1).

66149903 is an equidigital number, since it uses as much as digits as its factorization.

66149903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 66149903 is about 8133.2590638686. The cubic root of 66149903 is about 404.4297272857.

The spelling of 66149903 in words is "sixty-six million, one hundred forty-nine thousand, nine hundred three".