66006511 has 4 divisors (see below), whose sum is σ = 66098032. Its totient is φ = 65914992.

The previous prime is 66006503. The next prime is 66006517. The reversal of 66006511 is 11560066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66006511 - 2³ = 66006503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66006517) 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, 44670 + ... + 46123.

It is an arithmetic number, because the mean of its divisors is an integer number (16524508).

Almost surely, 2^66006511 is an apocalyptic number.

66006511 is a deficient number, since it is larger than the sum of its proper divisors (91521).

66006511 is an equidigital number, since it uses as much as digits as its factorization.

66006511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91520.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 66006511 is about 8124.4391191023. The cubic root of 66006511 is about 404.1372907736.

Adding to 66006511 its reverse (11560066), we get a palindrome (77566577).

The spelling of 66006511 in words is "sixty-six million, six thousand, five hundred eleven".