66011001 has 16 divisors (see below), whose sum is σ = 100712448. Its totient is φ = 37674000.

The previous prime is 66010991. The next prime is 66011003. The reversal of 66011001 is 10011066.

It is not a de Polignac number, because 66011001 - 2⁵ = 66010969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66011003) 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, 22806 + ... + 25536.

It is an arithmetic number, because the mean of its divisors is an integer number (6294528).

Almost surely, 2^66011001 is an apocalyptic number.

It is an amenable number.

66011001 is a deficient number, since it is larger than the sum of its proper divisors (34701447).

66011001 is a wasteful number, since it uses less digits than its factorization.

66011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 66011001 is about 8124.7154411708. The cubic root of 66011001 is about 404.1464541893.

Adding to 66011001 its reverse (10011066), we get a palindrome (76022067).

The spelling of 66011001 in words is "sixty-six million, eleven thousand, one".