66011505 has 16 divisors (see below), whose sum is σ = 120706944. Its totient is φ = 30176640.

The previous prime is 66011497. The next prime is 66011509. The reversal of 66011505 is 50511066.

It is not a de Polignac number, because 66011505 - 2³ = 66011497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66011509) 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, 314236 + ... + 314445.

It is an arithmetic number, because the mean of its divisors is an integer number (7544184).

Almost surely, 2^66011505 is an apocalyptic number.

It is an amenable number.

66011505 is a deficient number, since it is larger than the sum of its proper divisors (54695439).

66011505 is a wasteful number, since it uses less digits than its factorization.

66011505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628696.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 66011505 is about 8124.7464575825. The cubic root of 66011505 is about 404.1474827517.

The spelling of 66011505 in words is "sixty-six million, eleven thousand, five hundred five".