66949605 has 16 divisors (see below), whose sum is σ = 119021760. Its totient is φ = 35706384.

The previous prime is 66949591. The next prime is 66949607. The reversal of 66949605 is 50694966.

It is not a de Polignac number, because 66949605 - 2¹² = 66945509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66949607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247827 + ... + 248096.

It is an arithmetic number, because the mean of its divisors is an integer number (7438860).

Almost surely, 2^66949605 is an apocalyptic number.

It is an amenable number.

66949605 is a deficient number, since it is larger than the sum of its proper divisors (52072155).

66949605 is a wasteful number, since it uses less digits than its factorization.

66949605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495937 (or 495931 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 66949605 is about 8182.2738282216. The cubic root of 66949605 is about 406.0529528027.

The spelling of 66949605 in words is "sixty-six million, nine hundred forty-nine thousand, six hundred five".