66200709 has 4 divisors (see below), whose sum is σ = 88267616. Its totient is φ = 44133804.

The previous prime is 66200683. The next prime is 66200723. The reversal of 66200709 is 90700266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66200709 - 2¹³ = 66192517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66200749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11033449 + ... + 11033454.

It is an arithmetic number, because the mean of its divisors is an integer number (22066904).

Almost surely, 2^66200709 is an apocalyptic number.

It is an amenable number.

66200709 is a deficient number, since it is larger than the sum of its proper divisors (22066907).

66200709 is a wasteful number, since it uses less digits than its factorization.

66200709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22066906.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 66200709 is about 8136.3818125749. The cubic root of 66200709 is about 404.5332406576.

The spelling of 66200709 in words is "sixty-six million, two hundred thousand, seven hundred nine".