66505239 has 16 divisors (see below), whose sum is σ = 100931040. Its totient is φ = 43254720.

The previous prime is 66505217. The next prime is 66505249. The reversal of 66505239 is 93250566.

It is not a de Polignac number, because 66505239 - 2¹² = 66501143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505249) 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, 28932 + ... + 31145.

It is an arithmetic number, because the mean of its divisors is an integer number (6308190).

Almost surely, 2^66505239 is an apocalyptic number.

66505239 is a deficient number, since it is larger than the sum of its proper divisors (34425801).

66505239 is a wasteful number, since it uses less digits than its factorization.

66505239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60127 (or 60121 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 66505239 is about 8155.0744325236. The cubic root of 66505239 is about 405.1525899644.

The spelling of 66505239 in words is "sixty-six million, five hundred five thousand, two hundred thirty-nine".