66520111 has 8 divisors (see below), whose sum is σ = 76097664. Its totient is φ = 56961240.

The previous prime is 66520063. The next prime is 66520151. The reversal of 66520111 is 11102566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66520111 - 2⁷ = 66519983 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 (66520151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4056 + ... + 12226.

It is an arithmetic number, because the mean of its divisors is an integer number (9512208).

Almost surely, 2^66520111 is an apocalyptic number.

66520111 is a deficient number, since it is larger than the sum of its proper divisors (9577553).

66520111 is a wasteful number, since it uses less digits than its factorization.

66520111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9341.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 66520111 is about 8155.9862064621. The cubic root of 66520111 is about 405.1827879876.

Adding to 66520111 its reverse (11102566), we get a palindrome (77622677).

The spelling of 66520111 in words is "sixty-six million, five hundred twenty thousand, one hundred eleven".