66611907 has 6 divisors (see below), whose sum is σ = 96217212. Its totient is φ = 44407932.

The previous prime is 66611873. The next prime is 66611917. The reversal of 66611907 is 70911666.

It is not a de Polignac number, because 66611907 - 2⁸ = 66611651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66611917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3700653 + ... + 3700670.

It is an arithmetic number, because the mean of its divisors is an integer number (16036202).

Almost surely, 2^66611907 is an apocalyptic number.

66611907 is a deficient number, since it is larger than the sum of its proper divisors (29605305).

66611907 is a wasteful number, since it uses less digits than its factorization.

66611907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7401329 (or 7401326 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 66611907 is about 8161.6117893465. The cubic root of 66611907 is about 405.3690828427.

The spelling of 66611907 in words is "sixty-six million, six hundred eleven thousand, nine hundred seven".