66709245 has 16 divisors (see below), whose sum is σ = 108749952. Its totient is φ = 34906560.

The previous prime is 66709231. The next prime is 66709249. The reversal of 66709245 is 54290766.

It is not a de Polignac number, because 66709245 - 2⁵ = 66709213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66709249) 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, 41161 + ... + 42750.

It is an arithmetic number, because the mean of its divisors is an integer number (6796872).

Almost surely, 2^66709245 is an apocalyptic number.

It is an amenable number.

66709245 is a deficient number, since it is larger than the sum of its proper divisors (42040707).

66709245 is a wasteful number, since it uses less digits than its factorization.

66709245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83972.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 66709245 is about 8167.5727728622. The cubic root of 66709245 is about 405.5664380085.

The spelling of 66709245 in words is "sixty-six million, seven hundred nine thousand, two hundred forty-five".