66238305 has 16 divisors (see below), whose sum is σ = 121121664. Its totient is φ = 30280320.

The previous prime is 66238279. The next prime is 66238309. The reversal of 66238305 is 50383266.

66238305 = 813² + 814² + ... + 902².

It is not a de Polignac number, because 66238305 - 2⁶ = 66238241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66238309) 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, 315316 + ... + 315525.

It is an arithmetic number, because the mean of its divisors is an integer number (7570104).

Almost surely, 2^66238305 is an apocalyptic number.

It is an amenable number.

66238305 is a deficient number, since it is larger than the sum of its proper divisors (54883359).

66238305 is a wasteful number, since it uses less digits than its factorization.

66238305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630856.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 66238305 is about 8138.6918482026. The cubic root of 66238305 is about 404.6098055654.

The spelling of 66238305 in words is "sixty-six million, two hundred thirty-eight thousand, three hundred five".