66340511 has 16 divisors (see below), whose sum is σ = 71733600. Its totient is φ = 61129728.

The previous prime is 66340499. The next prime is 66340517. The reversal of 66340511 is 11504366.

It is a cyclic number.

It is not a de Polignac number, because 66340511 - 2¹⁰ = 66339487 is a prime.

It is a super-2 number, since 2×66340511² = 8802126799482242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66340517) 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, 246485 + ... + 246753.

It is an arithmetic number, because the mean of its divisors is an integer number (4483350).

Almost surely, 2^66340511 is an apocalyptic number.

66340511 is a deficient number, since it is larger than the sum of its proper divisors (5393089).

66340511 is a wasteful number, since it uses less digits than its factorization.

66340511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 66340511 is about 8144.9684468388. The cubic root of 66340511 is about 404.8178035329.

Adding to 66340511 its reverse (11504366), we get a palindrome (77844877).

The spelling of 66340511 in words is "sixty-six million, three hundred forty thousand, five hundred eleven".