66406111 has 8 divisors (see below), whose sum is σ = 66947904. Its totient is φ = 65867040.

The previous prime is 66406079. The next prime is 66406163. The reversal of 66406111 is 11160466.

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

It is a cyclic number.

It is not a de Polignac number, because 66406111 - 2⁵ = 66406079 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 (66406181) 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, 85521 + ... + 86293.

It is an arithmetic number, because the mean of its divisors is an integer number (8368488).

Almost surely, 2^66406111 is an apocalyptic number.

66406111 is a deficient number, since it is larger than the sum of its proper divisors (541793).

66406111 is a wasteful number, since it uses less digits than its factorization.

66406111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 66406111 is about 8148.9944778482. The cubic root of 66406111 is about 404.9511926145.

Adding to 66406111 its reverse (11160466), we get a palindrome (77566577).

The spelling of 66406111 in words is "sixty-six million, four hundred six thousand, one hundred eleven".