66049209 has 16 divisors (see below), whose sum is σ = 98280000. Its totient is φ = 43839648.

The previous prime is 66049201. The next prime is 66049213. The reversal of 66049209 is 90294066.

It is not a de Polignac number, because 66049209 - 2³ = 66049201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66049201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1042 + ... + 11540.

It is an arithmetic number, because the mean of its divisors is an integer number (6142500).

Almost surely, 2^66049209 is an apocalyptic number.

It is an amenable number.

66049209 is a deficient number, since it is larger than the sum of its proper divisors (32230791).

66049209 is a wasteful number, since it uses less digits than its factorization.

66049209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10741 (or 10735 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 66049209 is about 8127.0664449111. The cubic root of 66049209 is about 404.2244141716.

The spelling of 66049209 in words is "sixty-six million, forty-nine thousand, two hundred nine".