66849091 has 4 divisors (see below), whose sum is σ = 67051384. Its totient is φ = 66646800.

The previous prime is 66849073. The next prime is 66849119. The reversal of 66849091 is 19094866.

66849091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66849091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66849001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100650 + ... + 101311.

It is an arithmetic number, because the mean of its divisors is an integer number (16762846).

It is a Poulet number, since it divides 2^66849090-1.

Almost surely, 2^66849091 is an apocalyptic number.

66849091 is a deficient number, since it is larger than the sum of its proper divisors (202293).

66849091 is a wasteful number, since it uses less digits than its factorization.

66849091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202292.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 66849091 is about 8176.1293409535. The cubic root of 66849091 is about 405.8496434192.

The spelling of 66849091 in words is "sixty-six million, eight hundred forty-nine thousand, ninety-one".